Organic electroluminescent device

ABSTRACT

An organic electroluminescent device having low driving voltage, high luminous efficiency, and a long lifetime is provided by combining various materials for an organic EL device, which are excellent, as materials for an organic electroluminescent device having high efficiency and high durability, in hole and electron injection/transport performances, electron blocking ability, stability in a thin-film state and durability, so as to allow the respective materials to effectively reveal their characteristics. In the organic electroluminescent device having at least an anode, a hole transport layer, a light emitting layer, an electron transport layer and a cathode in this order, the hole transport layer includes an arylamine compound represented by the following general formula (1), and the light emitting layer includes an amine derivative of the following general formula (2) having a condensed ring structure.

TECHNICAL FIELD

The present invention relates to an organic electroluminescent device which is a preferred self-luminous device for various display devices. Specifically, this invention relates to organic electroluminescent devices (hereinafter referred to as organic EL devices) using specific arylamine compounds and specific amine derivatives having a condensed ring structure (and specific compounds having an anthracene ring structure).

BACKGROUND ART

The organic EL device is a self-luminous device and has been actively studied for their brighter, superior visibility and the ability to display clearer images in comparison with liquid crystal devices.

In 1987, C. W. Tang and colleagues at Eastman Kodak developed a laminated structure device using materials assigned with different roles, realizing practical applications of an organic EL device with organic materials. These researchers laminated an electron-transporting phosphor and a hole-transporting organic substance, and injected both charges into a phosphor layer to cause emission in order to obtain a high luminance of 1,000 cd/m² or more at a voltage of 10 V or less (refer to Patent Documents 1 and 2, for example).

To date, various improvements have been made for practical applications of the organic EL device. Various roles of the laminated structure are further subdivided to provide an electroluminescence device that includes an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a cathode successively formed on a substrate, and high efficiency and durability have been achieved by the electroluminescence device (refer to Non-Patent Document 1, for example).

Further, there have been attempts to use triplet excitons for further improvements of luminous efficiency, and the use of a phosphorescence-emitting compound has been examined (refer to Non-Patent Document 2, for example).

Devices that use light emission caused by thermally activated delayed fluorescence (TADF) have also been developed. In 2011, Adachi et al. at Kyushu University, National University Corporation realized 5.3% external quantum efficiency with a device using a thermally activated delayed fluorescent material (refer to Non-Patent Document 3, for example).

The light emitting layer can be also fabricated by doping a charge-transporting compound generally called a host material, with a fluorescent compound, a phosphorescence-emitting compound, or a delayed fluorescent-emitting material. As described in the Non-Patent Document, the selection of organic materials in an organic EL device greatly influences various device characteristics such as efficiency and durability (refer to Non-Patent Document 2, for example).

In an organic EL device, charges injected from both electrodes recombine in a light emitting layer to cause emission. What is important here is how efficiently the hole and electron charges are transferred to the light emitting layer in order to form a device having excellent carrier balance. The probability of hole-electron recombination can be improved by improving hole injectability and electron blocking performance of blocking injected electrons from the cathode, and high luminous efficiency can be obtained by confining excitons generated in the light emitting layer. The role of a hole transport material is therefore important, and there is a need for a hole transport material that has high hole injectability, high hole mobility, high electron blocking performance, and high durability to electrons.

Heat resistance and amorphousness of the materials are also important with respect to the lifetime of the device. The materials with low heat resistance cause thermal decomposition even at a low temperature by heat generated during the drive of the device, which leads to the deterioration of the materials. The materials with low amorphousness cause crystallization of a thin film even in a short time and lead to the deterioration of the device. The materials in use are therefore required to have characteristics of high heat resistance and satisfactory amorphousness.

N,N′-diphenyl-N,N′-di(α-naphthyl)benzidine (NPD) and various aromatic amine derivatives are known as the hole transport materials used for the organic EL device (refer to Patent Documents 1 and 2, for example). Although NPD has desirable hole transportability, its glass transition point (Tg), which is an index of heat resistance, is as low as 96° C., which causes the degradation of device characteristics by crystallization under a high-temperature condition (refer to Non-Patent Document 4, for example). The aromatic amine derivatives described in the Patent Documents include a compound known to have an excellent hole mobility of 10⁻³ cm²/Vs or higher (refer to Patent Documents 1 and 2, for example). However, since the compound is insufficient in terms of electron blocking performance, some of the electrons pass through the light emitting layer, and improvements in luminous efficiency cannot be expected. For such a reason, a material with higher electron blocking performance, a more stable thin-film state and higher heat resistance is needed for higher efficiency. Although an aromatic amine derivative having high durability is reported (refer to Patent Document 3, for example), the derivative is used as a charge transporting material used in an electrophotographic photoconductor, and there is no example of using the derivative in the organic EL device.

Arylamine compounds having a substituted carbazole structure are proposed as compounds improved in the characteristics such as heat resistance and hole injectability (refer to Patent Documents 4 and 5, for example). However, while the devices using these compounds for the hole injection layer or the hole transport layer have been improved in heat resistance, luminous efficiency and the like, the improvements are still insufficient. Further lower driving voltage and higher luminous efficiency are therefore needed.

In order to improve characteristics of the organic EL device and to improve the yield of the device production, it has been desired to develop a device having high luminous efficiency, low driving voltage and a long lifetime by using in combination the materials that excel in hole and electron injection/transport performances, stability as a thin film and durability, permitting holes and electrons to be highly efficiently recombined together.

Further, in order to improve characteristics of the organic EL device, it has been desired to develop a device that maintains carrier balance and has high efficiency, low driving voltage and a long lifetime by using in combination the materials that excel in hole and electron injection/transport performances, stability as a thin film and durability.

CITATION LIST Patent Documents

-   Patent Document 1: JP-A-8-048656 -   Patent Document 2: Japanese Patent No. 3194657 -   Patent Document 3: Japanese Patent No. 4943840 -   Patent Document 4: JP-A-2006-151979 -   Patent Document 5: WO2008/62636 -   Patent Document 6: WO2011/059000 -   Patent Document 7: WO2003/060956 -   Patent Document 8: KR-A-2013-060157 -   Patent Document 9: JP-A-7-126615 -   Patent Document 10: JP-A-8-048656 -   Patent Document 11: JP-A-2005-108804

Non-Patent Documents

-   Non-Patent Document 1: The Japan Society of Applied Physics, 9th     Lecture Preprints, pp. 55 to 61 (2001) -   Non-Patent Document 2: The Japan Society of Applied Physics, 9th     Lecture Preprints, pp. 23 to 31 (2001) -   Non-Patent Document 3: Appl. Phys. Let., 98, 083302 (2011) -   Non-Patent Document 4: Organic EL Symposium, the 3rd Regular     presentation Preprints, pp. 13 to 14 (2006)

SUMMARY OF THE INVENTION Technical Problem

An object of the present invention is to provide an organic EL device having low driving voltage, high luminous efficiency, and a long lifetime, by combining various materials for an organic EL device, which are excellent, as materials for an organic EL device having high efficiency and high durability, in hole and electron injection/transport performances, electron blocking ability, stability in a thin-film state and durability, so as to allow the respective materials to effectively reveal their characteristics.

Physical properties of the organic EL device to be provided by the present invention include (1) high luminous efficiency and high power efficiency, (2) low actual driving voltage, and (3) a long lifetime.

Solution to Problem

To achieve the above object, the present inventors have noted that an arylamine material is excellent in hole injection and transport abilities, stability as a thin film and durability, amine derivatives having a condensed ring structure are excellent in luminous efficiency. They have selected specific arylamine compounds and amine derivatives having specific structures and having a condensed ring structure, and have produced various organic EL devices by combining a hole transport material and a light-emitting material such that holes can be efficiently injected and transported into a light emitting layer. Then, they have intensively conducted characteristic evaluations of the devices. Also, they have noted that compounds having an anthracene ring structure are excellent in electron injection and transport abilities, stability as a thin film and durability. They have selected specific compounds having an anthracene ring structure to improve electron injection/transport efficiency to the light emitting layer, and have produced various organic EL devices by combining a hole transport material, a light-emitting material, and an electron transport material in good carrier balance that matching characteristics of the light-emitting material. Then, they have intensively conducted characteristic evaluations of the devices. Further, they have formed a hole transport layer having a two-layer structure of a first hole transport layer and a second hole transport layer, and have selected two specific kinds of arylamine compounds. They have selected a material of a first hole transport layer such that holes can be more efficiently injected and transported into a light emitting layer, and have selected a material that excels in electron blocking performance as a second hole transport layer. They have produced various organic EL devices by refining combinations of those in good carrier balance that more matching characteristics of the light-emitting material. Then, they have intensively conducted characteristic evaluations of the devices. As a result, they have completed the present invention.

Specifically, according to the present invention, the following organic EL devices are provided.

1) An organic EL device having at least an anode, a hole transport layer, a light emitting layer, an electron transport layer and a cathode in this order, wherein the hole transport layer includes an arylamine compound of the following general formula (1), and the light emitting layer includes an amine derivative of the following general formula (2) having a condensed ring structure.

In the formula, Ar₁ to Ar₄ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.

In the formula, A₁ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond. Ar₅ and Ar₆ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group, where Ar₅ and Ar₆ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. R₁ to R₄ may be the same or different, and represent a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, substituted or unsubstituted aryloxy, or a disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group, where R₁ to R₄ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring, and R₁ to R₄ and the benzene ring binding with R₁ to R₄ may bind to each other via substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group. R₅ to R₇ may be the same or different, represent a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy, where R₅ to R₇ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring, and R₅ to R₇ and the benzene ring binding with R₅ to R₇ may bind to each other via substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group. R₈ and R₉ may be the same or different, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy, where R₈ and R₉ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.

2) The organic EL device of 1), wherein the electron transport layer includes a compound of the following general formula (3) having an anthracene ring structure.

In the formula, A₂ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond. B represents a substituted or unsubstituted aromatic heterocyclic group. C represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group. D may be the same or different, and represents a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, trifluoromethyl, linear or branched alkyl of 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group. p represents 7 or 8, and q represents 1 or 2 while maintaining a relationship that a sum of p and q is 9.

3) The organic EL device of 2), wherein the compound having an anthracene ring structure is a compound of the following general formula (3a) having an anthracene ring structure.

In the formula, A₂ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond. Ar₇, Ar₈, and Ar₉ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group. R₁₀ to R₁₆ may be the same or different, and represent a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy, where R₁₀ to R₁₆ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. X₁, X₂, X₃, and X₄ represent a carbon atom or a nitrogen atom, where only one of X₁, X₂, X₃, and X₄ is a nitrogen atom, and the nitrogen atom in this case does not have the hydrogen atom or the substituent for R₁₀ to R₁₃.

4) The organic EL device of 2), wherein the compound having an anthracene ring structure is a compound of the following general formula (3b) having an anthracene ring structure.

In the formula, A₂ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond. Ar₁₀, Ar₁₁, and Ar₁₂ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.

5) The organic EL device of 2), wherein the compound having an anthracene ring structure is a compound of the following general formula (3c) having an anthracene ring structure.

In the formula, A₂ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond. Ar₁₃, Ar₁₄, and Ar₁₅ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group. R₁₇ represents a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy.

6) The organic EL device of any one of 1) to 5), wherein the hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, and the second hole transport layer includes the arylamine compound of the general formula (1).

7) The organic EL device of any one of 1) to 6), wherein the light emitting layer includes an anthracene derivative.

8) The organic EL device of 7), wherein the light emitting layer includes a host material that is an anthracene derivative.

Specific examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1) include phenyl, biphenylyl, terphenylyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, indenyl, pyrenyl, perylenyl, fluoranthenyl, triphenylenyl, pyridyl, pyrimidinyl, triazinyl, furyl, pyrrolyl, thienyl, quinolyl, isoquinolyl, benzofuranyl, benzothienyl, indolyl, carbazolyl, benzooxazolyl, benzothiazolyl, quinoxalinyl, benzoimidazolyl, pyrazolyl, dibenzofuranyl, dibenzothienyl, naphthyridinyl, phenanthrolinyl, acridinyl, and carbolinyl.

Specific examples of the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1) include a deuterium atom; cyano; nitro; halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom; linear or branched alkyls of 1 to 6 carbon atoms such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, and n-hexyl; linear or branched alkyloxy of 1 to 6 carbon atoms such as methyloxy, ethyloxy, and propyloxy; alkenyl such as vinyl, and allyl; aryloxy such as phenyloxy, and tolyloxy; arylalkyloxy such as benzyloxy, and phenethyloxy; aromatic hydrocarbon groups or condensed polycyclic aromatic groups such as phenyl, biphenylyl, terphenylyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, indenyl, pyrenyl, perylenyl, fluoranthenyl, and triphenylenyl; aromatic heterocyclic groups such as pyridyl, pyrimidinyl, triazinyl, thienyl, furyl, pyrrolyl, quinolyl, isoquinolyl, benzofuranyl, benzothienyl, indolyl, carbazolyl, benzooxazolyl, benzothiazolyl, quinoxalinyl, benzoimidazolyl, pyrazolyl, dibenzofuranyl, dibenzothienyl, and carbolinyl; arylvinyls such as styryl, and naphthylvinyl; acyl such as acetyl, and benzoyl; and silyl such as trimethylsilyl, and triphenylsilyl. These substituents may be further substituted with the exemplified substituents above. These substituents may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

Specific examples of the “aromatic hydrocarbon”, the “aromatic heterocyclic ring”, or the “condensed polycyclic aromatics” of the “substituted or unsubstituted aromatic hydrocarbon”, the “substituted or unsubstituted aromatic heterocyclic ring”, or the “substituted or unsubstituted condensed polycyclic aromatics” in the “divalent group of a substituted or unsubstituted aromatic hydrocarbon”, the “divalent group of a substituted or unsubstituted aromatic heterocyclic ring”, or the “divalent group of substituted or unsubstituted condensed polycyclic aromatics” represented by A₁ in the general formula (2) include benzene, biphenyl, terphenyl, tetrakisphenyl, styrene, naphthalene, anthracene, acenaphthalene, fluorene, phenanthrene, indane, pyrene, triphenylen, pyridine, pyrimidine, triazine, pyrrole, furan, thiophene, quinoline, isoquinoline, benzofuran, benzothiophene, indoline, carbazole, carboline, benzoxazole, benzothiazole, quinoxaline, benzimidazole, pyrazole, dibenzofuran, dibenzothiophene, naphthyridine, phenanthroline, and acridine.

The “divalent group of a substituted or unsubstituted aromatic hydrocarbon”, the “divalent group of a substituted or unsubstituted aromatic heterocyclic ring”, or the “divalent group of substituted or unsubstituted condensed polycyclic aromatics” represented by A₁ in the general formula (2) is a divalent group that results from the removal of two hydrogen atoms from the above “aromatic hydrocarbon”, “aromatic heterocyclic ring”, or “condensed polycyclic aromatics”.

These divalent groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar_(y) and Ar₆ in the general formula (2) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Specific examples of the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₁ to R₇ in the general formula (2) include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, cyclopentyl, cyclohexyl, 1-adamantyl, 2-adamantyl, vinyl, allyl, isopropenyl, and 2-butenyl. These groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. These groups (R₁ to R₇) and the benzene ring directly binding with these groups (R₁ to R₇) may bind to each other via a linking group such as substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.

Specific examples of the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁ to R₇ in the general formula (2) include a deuterium atom; cyano; nitro; halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom; linear or branched alkyloxy of 1 to 6 carbon atoms such as methyloxy, ethyloxy, and propyloxy; alkenyl such as vinyl, and allyl; aryloxy such as phenyloxy, and tolyloxy; arylalkyloxy such as benzyloxy, and phenethyloxy; aromatic hydrocarbon groups or condensed polycyclic aromatic groups such as phenyl, biphenylyl, terphenylyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, indenyl, pyrenyl, perylenyl, fluoranthenyl, and triphenylenyl; aromatic heterocyclic groups such as pyridyl, pyrimidinyl, triazinyl, thienyl, furyl, pyrrolyl, quinolyl, isoquinolyl, benzofuranyl, benzothienyl, indolyl, carbazolyl, benzooxazolyl, benzothiazolyl, quinoxalinyl, benzoimidazolyl, pyrazolyl, dibenzofuranyl, dibenzothienyl, and carbolinyl; disubstituted amino groups substituted with an aromatic hydrocarbon group or a condensed polycyclic aromatic group, such as diphenylamino, and dinaphthylamino; disubstituted amino groups substituted with an aromatic heterocyclic group, such as dipyridylamino, and dithienylamino; and disubstituted amino groups substituted with a substituent selected from an aromatic hydrocarbon group, a condensed polycyclic aromatic group, or an aromatic heterocyclic group. These substituents may be further substituted with the exemplified substituents above. These substituents may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

Specific examples of the “linear or branched alkyloxy of 1 to 6 carbon atoms” or the “cycloalkyloxy of 5 to 10 carbon atoms” in the “linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent” or the “cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent” represented by R₁ to R₇ in the general formula (2) include methyloxy, ethyloxy, n-propyloxy, isopropyloxy, n-butyloxy, tert-butyloxy, n-pentyloxy, n-hexyloxy, cyclopentyloxy, cyclohexyloxy, cycloheptyloxy, cyclooctyloxy, 1-adamantyloxy, and 2-adamantyloxy. These groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. These groups (R₁ to R₇) and the benzene ring directly binding with these groups (R₁ to R₇) may bind to each other via a linking group such as substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁ to R₇ in the general formula (2), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by R₁ to R₇ in the general formula (2) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1). These groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. These groups (R₁ to R₇) and the benzene ring directly binding with these groups (R₁ to R₇) may bind to each other via a linking group such as substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.

These groups may have a substituent, and specific examples of the substituent include a deuterium atom; cyano; nitro; halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom; linear or branched alkyls of 1 to 6 carbon atoms such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, and n-hexyl; linear or branched alkyloxy of 1 to 6 carbon atoms such as methyloxy, ethyloxy, and propyloxy; alkenyl such as vinyl, and allyl; aryloxy such as phenyloxy, and tolyloxy; arylalkyloxy such as benzyloxy, and phenethyloxy; aromatic hydrocarbon groups or condensed polycyclic aromatic groups such as phenyl, biphenylyl, terphenylyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, indenyl, pyrenyl, perylenyl, fluoranthenyl, and triphenylenyl; aromatic heterocyclic groups such as pyridyl, pyrimidinyl, triazinyl, thienyl, furyl, pyrrolyl, quinolyl, isoquinolyl, benzofuranyl, benzothienyl, indolyl, carbazolyl, benzooxazolyl, benzothiazolyl, quinoxalinyl, benzoimidazolyl, pyrazolyl, dibenzofuranyl, dibenzothienyl, and carbolinyl; arylvinyls such as styryl, and naphthylvinyl; acyl such as acetyl, and benzoyl; silyl such as trimethylsilyl, and triphenylsilyl; disubstituted amino groups substituted with an aromatic hydrocarbon group or a condensed polycyclic aromatic group, such as diphenylamino, and dinaphthylamino; disubstituted amino groups substituted with an aromatic heterocyclic group, such as dipyridylamino, and dithienylamino; and disubstituted amino groups substituted with a substituent selected from an aromatic hydrocarbon group, a condensed polycyclic aromatic group, or an aromatic heterocyclic group. These substituents may be further substituted with the exemplified substituents above. These substituents may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

Specific examples of the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₁ to R₇ in the general formula (2) include phenyloxy, biphenylyloxy, terphenylyloxy, naphthyloxy, anthracenyloxy, phenanthrenyloxy, fluorenyloxy, indenyloxy, pyrenyloxy, and perylenyloxy. These groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. These groups (R₁ to R₇) and the benzene ring directly binding with these groups (R₁ to R₇) may bind to each other via a linking group such as substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by R₁ to R₇ in the general formula (2), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group” represented by R₁ to R₄ in the general formula (2) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by R₁ to R₇ in the general formula (2).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

In the “disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group” represented by R₁ to R₄ in the general formula (2), these groups (R₁ to R₄) may bind to each other via the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” of these groups (R₁ to R₄), and a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. These groups (R₁ to R₄) and the benzene ring directly binding with these groups (R₁ to R₄) may bind to each other via the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” of these groups (R₁ to R₄), and a linking group such as substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.

Examples of the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₈ and R₉ in the general formula (2) include the same groups exemplified as the groups for the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₁ to R₇ in the general formula (2). These groups may bind to each other via a linking group such as a single bond, substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent”, the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by R₁ to R₇ in the general formula (2), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by R₈ and R₉ in the general formula (2) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by R₁ to R₇ in the general formula (2). These groups may bind to each other via a linking group such as a single bond, substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by R₁ to R₇ in the general formula (2), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₈ and R₉ in the general formula (2) include the same groups exemplified as the groups for the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₁ to R₇ in the general formula (2). These groups may bind to each other via a linking group such as a single bond, substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by R₁ to R₇ in the general formula (2), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “substituent” in the “mono-substituted amino group” of the linking group in the general formula (2) include the same substituents exemplified as the “substituent” of the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by R₁ to R₇ in the general formula (2).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by R₁ to R₇ in the general formula (2), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon”, the “aromatic heterocyclic ring”, or the “condensed polycyclic aromatics” of the “substituted or unsubstituted aromatic hydrocarbon”, the “substituted or unsubstituted aromatic heterocyclic ring”, or the “substituted or unsubstituted condensed polycyclic aromatics” in the “divalent group of a substituted or unsubstituted aromatic hydrocarbon”, the “divalent group of a substituted or unsubstituted aromatic heterocyclic ring”, or the “divalent group of substituted or unsubstituted condensed polycyclic aromatics” represented by A₂ in the general formula (3), the general formula (3a), the general formula (3b), and the general formula (3c) include the same compounds exemplified as the compounds for the “aromatic hydrocarbon”, the “aromatic heterocyclic ring”, or the “condensed polycyclic aromatics” of the “substituted or unsubstituted aromatic hydrocarbon”, the “substituted or unsubstituted aromatic heterocyclic ring”, or the “substituted or unsubstituted condensed polycyclic aromatics” in the “divalent group of a substituted or unsubstituted aromatic hydrocarbon”, the “divalent group of a substituted or unsubstituted aromatic heterocyclic ring”, or the “divalent group of substituted or unsubstituted condensed polycyclic aromatics” represented by A₁ in the general formula (2).

The “divalent group of a substituted or unsubstituted aromatic hydrocarbon”, the “divalent group of a substituted or unsubstituted aromatic heterocyclic ring”, or the “divalent group of substituted or unsubstituted condensed polycyclic aromatics” represented by A₂ in the general formula (3), the general formula (3a), the general formula (3b), and the general formula (3c) is a divalent group that results from the removal of two hydrogen atoms from the above “aromatic hydrocarbon”, “aromatic heterocyclic ring”, or “condensed polycyclic aromatics”.

These divalent groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Specific examples of the “aromatic heterocyclic group” in the “substituted or unsubstituted aromatic heterocyclic group” represented by B in the general formula (3) include triazinyl, pyridyl, pyrimidinyl, furyl, pyrrolyl, thienyl, quinolyl, isoquinolyl, benzofuranyl, benzothienyl, indolyl, carbazolyl, benzoxazolyl, benzothiazolyl, quinoxalinyl, benzoimidazolyl, pyrazolyl, dibenzofuranyl, dibenzothienyl, naphthyridinyl, phenanthrolinyl, acridinyl, and carbolinyl.

Specific examples of the “substituent” in the “substituted aromatic heterocyclic group” represented by B in the general formula (3) include a deuterium atom; cyano; nitro; halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom; linear or branched alkyls of 1 to 6 carbon atoms such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, and n-hexyl; cycloalkyls of 5 to 10 carbon atoms such as cyclopentyl, cyclohexyl, 1-adamantyl, and 2-adamantyl; linear or branched alkyloxys of 1 to 6 carbon atoms such as methyloxy, ethyloxy, and propyloxy; cycloalkyloxys of 5 to 10 carbon atoms such as cyclopentyloxy, cyclohexyloxy, 1-adamantyloxy, and 2-adamantyloxy; alkenyls such as vinyl, and allyl; aryloxys such as phenyloxy, and tolyloxy; arylalkyloxys such as benzyloxy, and phenethyloxy; aromatic hydrocarbon groups or condensed polycyclic aromatic groups such as phenyl, biphenylyl, terphenylyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, indenyl, pyrenyl, perylenyl, fluoranthenyl, and triphenylenyl; aromatic heterocyclic groups such as pyridyl, pyrimidinyl, triazinyl, thienyl, furyl, pyrrolyl, quinolyl, isoquinolyl, benzofuranyl, benzothienyl, indolyl, carbazolyl, benzoxazolyl, benzothiazolyl, quinoxalinyl, benzoimidazolyl, pyrazolyl, dibenzofuranyl, dibenzothienyl, and carbolinyl; aryloxys such as phenyloxy, biphenylyloxy, naphthyloxy, anthracenyloxy, phenanthrenyloxy; arylvinyls such as styryl, and naphthylvinyl; and acyls such as acetyl, and benzoyl. These substituents may be further substituted with the exemplified substituents above. These substituents may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by C in the general formula (3) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1). When a plurality of these groups bind to the same anthracene ring (when q is 2), these groups may be the same or different.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Specific examples of the “linear or branched alkyl of 1 to 6 carbon atoms” represented by D in the general formula (3) include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, and n-hexyl.

The plurality of D may be the same or different, and these groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by D in the general formula (3) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1). The plurality of D may be the same or different, and these groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar_(gy), Ar_(a), and Ar₉ in the general formula (3a) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Specific examples of the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₁₀ to R₁₆ in the general formula (3a) include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, cyclopentyl, cyclohexyl, 1-adamantyl, 2-adamantyl, vinyl, allyl, isopropenyl, and 2-butenyl. These groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

Specific examples of the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁₀ to R₁₆ in the general formula (3a) include a deuterium atom; cyano; nitro; halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom; linear or branched alkyloxy of 1 to 6 carbon atoms such as methyloxy, ethyloxy, and propyloxy; alkenyl such as vinyl, and allyl; aryloxy such as phenyloxy, and tolyloxy; arylalkyloxy such as benzyloxy, and phenethyloxy; aromatic hydrocarbon groups or condensed polycyclic aromatic groups such as phenyl, biphenylyl, terphenylyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, indenyl, pyrenyl, perylenyl, fluoranthenyl, and triphenylenyl; and aromatic heterocyclic groups such as pyridyl, pyrimidinyl, triazinyl, thienyl, furyl, pyrrolyl, quinolyl, isoquinolyl, benzofuranyl, benzothienyl, indolyl, carbazolyl, benzooxazolyl, benzothiazolyl, quinoxalinyl, benzoimidazolyl, pyrazolyl, dibenzofuranyl, dibenzothienyl, and carbolinyl. These substituents may be further substituted with the substituents exemplified above. These substituents may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

Specific examples of the “linear or branched alkyloxy of 1 to 6 carbon atoms”, or the “cycloalkyloxy of 5 to 10 carbon atoms” in the “linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent”, or the “cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent” represented by R₁₀ to R₁₆ in the general formula (3a) include methyloxy, ethyloxy, n-propyloxy, isopropyloxy, n-butyloxy, tert-butyloxy, n-pentyloxy, n-hexyloxy, cyclopentyloxy, cyclohexyloxy, cycloheptyloxy, cyclooctyloxy, 1-adamantyloxy, and 2-adamantyloxy. These groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by R₁₀ to R₁₆ in the general formula (3a) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1). These groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Specific examples of the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₁₀ to R₁₆ in the general formula (3a) include phenyloxy, biphenylyloxy, terphenylyloxy, naphthyloxy, anthracenyloxy, phenanthrenyloxy, fluorenyloxy, indenyloxy, pyrenyloxy, and perylenyloxy. These groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

In the general formula (3a), X₁, X₂, X₃, and X₄ represent a carbon atom or a nitrogen atom, and only one of X₁, X₂, X₃, and X₄ is a nitrogen atom. The nitrogen atom in this case does not have the hydrogen atom or the substituent for R₁ to R₄. That is, R₁₀ does not exist when X₁ is a nitrogen atom, R₁₁ does not exist when X₂ is a nitrogen atom, R₁₂ does not exist when X₃ is a nitrogen atom, and R₁₃ does not exist when X₄ is a nitrogen atom.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁₀, Ar₁₁, and Ar₁₂ in the general formula (3b) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁₃, Ar₁₄, and Ar₁₅ in the general formula (3c) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₁₇ in the general formula (3c) include the same groups exemplified as the groups for the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₁₀ to R₁₆ in the general formula (3a).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁₀ to R₁₆ in the general formula (3a).

Examples of the “linear or branched alkyloxy of 1 to 6 carbon atoms”, or the “cycloalkyloxy of 5 to 10 carbon atoms” in the “linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent”, or the “cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent” represented by R₁₇ in the general formula (3c) include the same groups exemplified as the groups for the “linear or branched alkyloxy of 1 to 6 carbon atoms”, or the “cycloalkyloxy of 5 to 10 carbon atoms” in the “linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent”, or the “cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent” represented by R₁₀ to R₁₆ in the general formula (3a).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁₀ to R₁₆ in the general formula (3a).

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by R₁₇ in the general formula (3c) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₁₇ in the general formula (3c) include the same groups exemplified as the groups for the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₁₀ to R₁₆ in the general formula (3a).

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Among the the arylamine compound of the general formula (1), the arylamine compound represented by the following general formulas (1a-a), (1a-b), (1b-a), (1c-a), (1c-b), or (1c-c) are preferable.

In the formula, Ar₁ to Ar₄ are as defined in the general formula (1).

Ar₁ to Ar₄ in the general formula (1) are preferably the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted oxygen-containing aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group”, far preferably, phenyl, biphenylyl, terphenylyl, naphthyl, phenanthrenyl, fluorenyl, or dibenzofuranyl.

It is preferable that Ar₁ and Ar₂, or Ar₃ and Ar₄ in the general formula (1) are different groups, and it is far preferable that Ar₁ and Ar₂, and Ar₃ and Ar₄ are different groups.

The “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1) is preferably a deuterium atom, the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent”, the “substituted or unsubstituted aromatic hydrocarbon group”, or the “substituted or unsubstituted condensed polycyclic aromatic group”, far preferably, a deuterium atom, phenyl, biphenylyl, naphthyl, or vinyl. It is also preferable that these groups bind to each other via a single bond to form a condensed aromatic ring.

A₁ in the general formula (2) is preferably the “divalent group of a substituted or unsubstituted aromatic hydrocarbon” or a single bond, far preferably, a divalent group that results from the removal of two hydrogen atoms from benzene, biphenyl, or naphthalene; or a single bond, particularly preferably a single bond.

Ar₅ and Ar₆ in the general formula (2) are preferably phenyl, biphenylyl, naphthyl, fluorenyl, indenyl, pyridyl, dibenzofuranyl, pyridobenzofuranyl.

Ar₅ and Ar₆ in the general formula (2) may directly bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring, or Ar₅ and Ar₆ in the general formula (2) may bind to each other via substituents of these groups, and single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

At least one of R₁ to R₄ in the general formula (2) is preferably the “disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group”; or the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” having, as a substituent, the “disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group”, far preferably, the “disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group”. In this case, R₂ is preferably the “disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group”, far preferably, only R₂ is the “disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group”.

The “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group” in this case is preferably phenyl, biphenylyl, naphthyl, fluorenyl, indenyl, pyridyl, dibenzofuranyl, pyridobenzofuranyl.

In the general formula (2), it is preferable that adjacent two groups of R₁ to R₄ or all groups of R₁ to R₄ are vinyl, and adjacent two vinyl groups may bind to each other via a single bond to form a condensed ring, that is, to form a naphthalene ring or a phenanthrene ring with the benzene ring binding with R₁ to R₄.

In the general formula (2), it is preferable that one of R₁ to R₄ is the “aromatic hydrocarbon group”, and the group and the benzene ring binding with R₁ to R₄ may bind to each other via substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. It is far preferred that the “aromatic hydrocarbon group” in this case is phenyl, and the group and the benzene ring binding with R₁ to R₄ may bind to each other via an oxygen atom, or a sulfur atom to form a ring, that is, to form a dibenzofuran ring or a dibenzothiophene ring with the benzene ring binding with R₁ to R₄.

In the general formula (2), it is preferable that one of R₅ to R₇ is the “aromatic hydrocarbon group”, and the group and the benzene ring binding with R₅ to R₇ may bind to each other via substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. It is far preferred that the “aromatic hydrocarbon group” in this case is phenyl, and the group and the benzene ring binding with R₅ to R₇ may bind to each other via an oxygen atom, or a sulfur atom to form a ring, that is, to form a dibenzofuran ring or a dibenzothiophene ring.

As described above, among the amine derivatives of the general formula (2) having a condensed ring structure, the embodiments represented by the following general formulas (2a-a), (2a-b), (2b-a), (2b-b), (2b-c), (2b-d), (2c-a), or (2c-b) as the embodiments in which R₁ to R₇ may bind to each other to form a ring, or R₁ to R₇ and the benzene ring binding with R₁ to R₇ may bind to each other to form a ring are preferable.

In the formula, X and Y may be the same or different, each representing an oxygen atom or a sulfur atom. A₁, Ar₅, Ar₆, R₁ to R₄, R₇, R₈, and R₉ are as defined in the general formula (2).

R₈ and R₉ in the general formula (2) are preferably the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted oxygen-containing aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group”, far preferably, phenyl, naphthyl, phenanthrenyl, pyridyl, quinolyl, isoquinolyl, dibenzofuranyl, particularly preferably phenyl.

Further, it is preferable that R₈ and R₉ may bind to each other via a linking group such as a single bond, substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring, and it is far preferred that these groups may bind to each other via a single bond to form a ring.

As described above, among the amine derivatives of the general formula (2) having a condensed ring structure, the embodiments represented by the following general formulas (2a-a1), (2a-b1), (2b-a1), (2b-b1), (2b-c1), (2b-dl), (2c-a1), or (2c-b1) as the embodiments in which R₈ and R₉ may bind to each other to form a ring are preferable.

In the formula, X and Y may be the same or different, each representing an oxygen atom or a sulfur atom. A₁, Ar₅, Ar₆, R₁ to R₄, and R₇ are as defined in the general formula (2).

A₁ is preferably bonded to the 2-position (or 7-position) of the fluorene ring.

In this case, the amine derivatives of the general formula (2) having a condensed ring structure are represented by the following general formula (2′).

Examples of the “aromatic heterocyclic group” in the “substituted or unsubstituted aromatic heterocyclic group” represented by B in the general formula (3) is preferably a nitrogen-containing aromatic heterocyclic group such as pyridyl, pyrimidinyl, pyrrolyl, quinolyl, isoquinolyl, indolyl, carbazolyl, benzoxazolyl, benzothiazolyl, quinoxalinyl, benzoimidazolyl, pyrazolyl, or carbolinyl, far preferably, pyridyl, pyrimidinyl, quinolyl, isoquinolyl, indolyl, pyrazolyl, benzoimidazolyl or carbolinyl.

With respect to p and q in the general formula (3), p represents 7 or 8, and q represents 1 or 2 while maintaining a relationship that a sum of p and q (p+q) is 9.

Among the compounds of the general formula (3) having an anthracene ring structure, the compounds of the general formula (3a), the general formula (3b) or the general formula (3c) having an anthracene ring structure are far preferably used.

A₂ in the general formula (3), the general formula (3a), the general formula (3b), or the general formula (3c) is preferably the “divalent group of a substituted or unsubstituted aromatic hydrocarbon”, or the “divalent group of substituted or unsubstituted condensed polycyclic aromatics”, far preferably, a divalent group that results from the removal of two hydrogen atoms from benzene, biphenyl, naphthalene, or phenanthrene.

In the organic EL device of the present invention, it is preferable that two hole transport layers are laminated. That is, the organic EL device of the present invention in this case have at least an anode, a first hole transport layer, a second hole transport layer, a light emitting layer, an electron transport layer, and a cathode in this order. In this case, the second hole transport layer preferably includes the arylamine compounds of the general formula (1). Further, the first hole transport layer far preferably includes an arylamine compound having a structure in which two to six triphenylamine structures are joined within a molecule via a single bond, or a divalent group that does not contain a heteroatom.

The arylamine compounds having a structure in which two to six triphenylamine structures are joined within a molecule via a single bond, or a divalent group that does not contain a heteroatom is preferably the arylamine compounds of the general formula (4) having two triphenylamine structures within a molecule, or the arylamine compounds of the general formula (5) having four triphenylamine structures within a molecule.

In the formula, R₁₈ to R₂₃ represent a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy. r₁₈ to r₂₃ may be the same or different, r₁₈, r₁₉, r₂₂, and r₂₃ representing an integer of 0 to 5, and r₂₀ and r₂₁ representing an integer of 0 to 4. When r₁₈, r₁₉, r₂₂, and r₂₃ are an integer of 2 to 5, or when r₂₀ and r₂₁ are an integer of 2 to 4, R₁₈ to R₂₃, a plurality of which bind to the same benzene ring, may be the same or different, and may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. L₁ represents a divalent group represented by the following structural formulas (C) to (G), or a single bond.

In the formula, R₂₄ to R₃₅ represent a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy. r₂₄ to r₃₅ may be the same or different, r₂₄, r₂₅, r₂₈, r₃₁, r₃₄, and r₃₅ representing an integer of 0 to 5, and r₂₆, r₂₇, r₂₉, r₃₀, r₃₂, and r₃₃ representing an integer of 0 to 4. When r₂₄, r₂₅, r₂₈, r₃₁, r₃₄, and r₃₅ are an integer of 2 to 5, or when r₂₆, r₂₇, r₂₉, r₃₀, r₃₂, and r₃₃ are an integer of 2 to 4, R₂₄ to R₃₅, a plurality of which bind to the same benzene ring, may be the same or different, and may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring. L₂, L₃, and L₄ may be the same or different, and represent a divalent group represented by the following structural formulas (B) to (G), or a single bond.

In the formula, n represents an integer of 1 to 3.

Examples of the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₁₈ to R₂₃ in the general formula (4) include the same groups exemplified as the groups for the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “linear or branched alkyloxy of 1 to 6 carbon atoms” or the “cycloalkyloxy of 5 to 10 carbon atoms” in the “linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent”, or the “cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent” represented by R₁₈ to R₂₃ in the general formula (4) include the same groups exemplified as the groups for the “linear or branched alkyloxy of 1 to 6 carbon atoms”, or the “cycloalkyloxy of 5 to 10 carbon atoms” in the “linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent” or the “cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by R₁₈ to R₂₃ in the general formula (4) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1). These groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₁₈ to R₂₃ in the general formula (4) include the same groups exemplified as the groups for the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

In the general formula (4), r₁₈ to r₂₃ may be the same or different, r₁₈, r₁₉, r₂₂, and r₂₃ representing an integer of 0 to 5, and r₂₀ and r₂₁ representing an integer of 0 to 4. When r₁₈, r₁₉, r₂₂, and r₂₃ are an integer of 2 to 5, or when r₂₀ and r₂₁ are an integer of 2 to 4, R₁₈ to R₂₃, a plurality of which bind to the same benzene ring, may be the same or different, and may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

Examples of the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₂₄ to R₃₅ in the general formula (5) include the same groups exemplified as the groups for the “linear or branched alkyl of 1 to 6 carbon atoms”, the “cycloalkyl of 5 to 10 carbon atoms”, or the “linear or branched alkenyl of 2 to 6 carbon atoms” in the “linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent”, the “cycloalkyl of 5 to 10 carbon atoms that may have a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “linear or branched alkyloxy of 1 to 6 carbon atoms” or the “cycloalkyloxy of 5 to 10 carbon atoms” in the “linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent”, or the “cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent” represented by R₂₄ to R₃₅ in the general formula (5) include the same groups exemplified as the groups for the “linear or branched alkyloxy of 1 to 6 carbon atoms”, or the “cycloalkyloxy of 5 to 10 carbon atoms” in the “linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent”, or the “cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “linear or branched alkyl of 1 to 6 carbon atoms having a substituent”, the “cycloalkyl of 5 to 10 carbon atoms having a substituent”, or the “linear or branched alkenyl of 2 to 6 carbon atoms having a substituent” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by R₂₄ to R₃₅ in the general formula (5) include the same groups exemplified as the groups for the “aromatic hydrocarbon group”, the “aromatic heterocyclic group”, or the “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group”, the “substituted or unsubstituted aromatic heterocyclic group”, or the “substituted or unsubstituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), these groups may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

Examples of the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₂₄ to R₃₅ in the general formula (5) include the same groups exemplified as the groups for the “aryloxy” in the “substituted or unsubstituted aryloxy” represented by R₁₀ to R₁₆ in the general formula (3a), and possible embodiments may also be the same embodiments as the exemplified embodiments.

These groups may have a substituent, and examples of the substituent include the same substituents exemplified as the “substituent” in the “substituted aromatic hydrocarbon group”, the “substituted aromatic heterocyclic group”, or the “substituted condensed polycyclic aromatic group” represented by Ar₁ to Ar₄ in the general formula (1), and possible embodiments may also be the same embodiments as the exemplified embodiments.

r₂₄ to r₃₅ in the general formula (5) may be the same or different, r₂₄, r₂₅, r₂₈, r₃₁, r₃₄, and r₃₅ representing an integer of 0 to 5, and r₂₆, r₂₇, r₂₉, r₃₀, r₃₂, and r₃₃ representing an integer of 0 to 4. When r₂₄, r₂₅, r₂₈, r₃₁, r₃₄, and r₃₅ are an integer of 2 to 5, or when r₂₆, r₂₇, r₂₉, r_(n), r₃₂, and r₃₃ are an integer of 2 to 4, R₂₄ to R₃₅, a plurality of which bind to the same benzene ring, may be the same or different, and may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring.

In the structural formula (B), n represents an integer of 1 to 3.

The arylamine compounds of the general formula (1), for preferred use in the organic EL device of the present invention, can be used as a constitutive material of a hole injection layer, an electron blocking layer, or a hole transport layer of an organic EL device. The arylamine compounds of the general formula (1) have high hole mobility, and are therefore preferred compounds as material of a hole injection layer or a hole transport layer. Further, the arylamine compounds of the general formula (1) have high electron blocking performance, and are therefore preferred compounds as material of an electron blocking layer.

The amine derivatives of the general formula (2) having a condensed ring structure, for preferred use in the organic EL device of the present invention, can be used as a constitutive material of a light emitting layer of an organic EL device. The amine derivatives of the general formula (2) having a condensed ring structure excel in luminous efficiency compared with conventional materials, and are therefore preferred compounds as dopant material of a light emitting layer.

The compounds of the general formula (3) having an anthracene ring structure, for preferable use in the organic EL device of the present invention, can be used as a constitutive material of an electron transport layer of an organic EL device.

The compounds of the general formula (3) having an anthracene ring structure excel in electron injection and transport abilities, and further excel in stability as a thin film and durability. The compounds are therefore preferred compounds as material of an electron transport layer.

The arylamine compounds of the general formula (4) having two triphenylamine structures within a molecule and the arylamine compounds of the general formula (5) having four triphenylamine structures within a molecule, for preferable use in a first hole transport layer, are preferred compounds as a constitutive material of a hole injection layer or a hole transport layer of an organic EL device in the case where a hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer for preferable embodiments in the organic EL device of the present invention.

A second hole transport layer preferably includes the arylamine compounds of the general formula (1) in the case where a hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer for preferable embodiments in the organic EL device of the present invention.

The organic EL device of the present invention combines materials for an organic EL device exceling in hole and electron injection/transport performances, stability as a thin film and durability, taking carrier balance that matching characteristics of a light-emitting material having a specific structure into consideration. Therefore, compared with the conventional organic EL devices, hole transport efficiency to a light emitting layer from a hole transport layer is improved, and electron transport efficiency to a light emitting layer from an electron transport layer is also improved (further, the organic EL device of the present invention combines two kinds of arylamine compounds having specific structures taking carrier balance and characteristics of materials into consideration in the case where a hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer). As a result, driving voltage is low, luminous efficiency is improved, and durability of the organic EL device can thereby be improved.

Thus, an organic EL device having low driving voltage, and high luminous efficiency, in particular, a long lifetime can be attained in the present invention.

Effects of the Invention

The organic EL device of the present invention can achieve an organic EL device having high efficiency, low driving voltage, and a long lifetime as a result of attaining efficient hole injection/transport into a light emitting layer by selecting specific arylamine compounds which excel in hole and electron injection/transport performances, stability as a thin film and durability, and which can effectively exhibit hole injection/transport roles, and by combining those compounds and amine derivatives having specific structures and having a condensed ring structure which excel in luminous efficiency. An organic EL device having low driving voltage, higher efficiency, and a long lifetime can be achieved by selecting specific arylamine compounds, and by combining those compounds and a specific electron transport material so as to achieve good carrier balance that matching characteristics of a light-emitting material having a specific structure. Furthermore, in the case where a hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, the organic EL device of the present invention can achieve an organic EL device having high efficiency and a long lifetime by combining two kinds of arylamine compounds having specific structures taking carrier balance and characteristics of materials into consideration. The organic EL device of the present invention can improve luminous efficiency, driving voltage, and durability of the conventional organic EL devices.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating the configuration of the organic EL devices of Examples 37 to 42 and Comparative Examples 1 and 2.

MODE FOR CARRYING OUT THE INVENTION

The following presents specific examples of preferred compounds among the arylamine compounds of the general formula (1) preferably used in the organic EL device of the present invention. The present invention, however, is not restricted to these compounds.

The following presents specific examples of preferred compounds among the amine derivatives of the general formula (2) having a condensed ring structure preferably used in the organic EL device of the present invention. The present invention, however, is not restricted to these compounds.

The following presents specific examples of preferred compounds among the compounds of the general formula (3a) having an anthracene ring structure preferably used in the organic EL device of the present invention. The present invention, however, is not restricted to these compounds.

The following presents specific examples of preferred compounds among the compounds of the general formula (3b) having an anthracene ring structure and preferably used in the organic EL device of the present invention. The present invention, however, is not restricted to these compounds.

The following presents specific examples of preferred compounds among the compounds of the general formula (3c) having an anthracene ring structure and preferably used in the organic EL device of the present invention. The present invention, however, is not restricted to these compounds.

The compounds described above having an anthracene ring structure can be synthesized by a known method (refer to Patent Documents 6 to 8, for example).

In the organic EL device of the present invention, the following presents specific examples of preferred compounds among the arylamine compounds of the general formula (4) having two triphenylamine structures within a molecule and preferably used in the first hole transport layer in the case where the hole transport layer has a two-layer structure of the first hole transport layer and the second hole transport layer. The present invention, however, is not restricted to these compounds.

In the organic EL device of the present invention, the following presents specific examples of preferred compounds in the arylamine compounds preferably used in the first hole transport layer and having two triphenylamine structures within a molecule in the arylamine compounds having a structure in which two to six triphenylamine structures are joined within a molecule via a single bond or a divalent group that does not contain a heteroatom in the case where the hole transport layer has a two-layer structure of the first hole transport layer and the second hole transport layer, besides the arylamine compounds of the general formula (4) having two triphenylamine structures within a molecule. The present invention, however, is not restricted to these compounds.

In the organic EL device of the present invention, the following presents specific examples of preferred compounds among the arylamine compounds of the general formula (5) having four triphenylamine structures within a molecule and preferably used in the first hole transport layer in the case where the hole transport layer has a two-layer structure of the first hole transport layer and the second hole transport layer. The present invention, however, is not restricted to these compounds.

The arylamine compounds of the general formula (4) having two triphenylamine structures within a molecule, and the arylamine compounds of the general formula (5) having four triphenylamine structures within a molecule can be synthesized by a known method (refer to Patent Documents 9 to 11, for example).

The arylamine compounds of the general formula (1) were purified by methods such as column chromatography; adsorption using, for example, a silica gel, activated carbon, or activated clay; recrystallization or crystallization using a solvent; and sublimation. The compounds were identified by an NMR analysis. A glass transition point (Tg) and a work function were measured as material property values. The glass transition point (Tg) can be used as an index of stability in a thin-film state, and the work function can be used as an index of hole transportability.

Other compounds used for the organic EL device of the present invention were purified by methods such as column chromatography; adsorption using, for example, a silica gel, activated carbon, or activated clay; and recrystallization or crystallization using a solvent; and finally purified by sublimation.

The glass transition point (Tg) was measured by a high-sensitive differential scanning calorimeter (DSC3100S produced by Bruker AXS) using powder.

For the measurement of the work function, a 100 nm-thick thin film was fabricated on an ITO substrate, and an ionization potential measuring device (PYS-202 produced by Sumitomo Heavy Industries, Ltd.) was used.

The organic EL device of the present invention may have a structure including an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode successively formed on a substrate, optionally with an electron blocking layer between the hole transport layer and the light emitting layer, a hole blocking layer between the light emitting layer and the electron transport layer, and an electron injection layer between the electron transport layer and the cathode. Some of the organic layers in the multilayer structure may be omitted, or may serve more than one function. For example, a single organic layer may serve as the hole injection layer and the hole transport layer, or as the electron injection layer and the electron transport layer. Further, the organic layers having a same function may have a laminate structure of two or more layers, for example, the hole transport layer may have a two-layer structure, the light emitting layer may have a two-layer structure, or the electron transport layer may have a two-layer structure. The hole transport layer preferably also has a two-layer structure of a first hole transport layer and a second hole transport layer as a structure of the organic EL device of the present invention.

Electrode materials with high work functions such as ITO and gold are used as the anode of the organic EL device of the present invention. The hole injection layer of the organic EL device of the present invention may be made of, for example, material such as starburst-type triphenylamine derivatives and various triphenylamine tetramers; porphyrin compounds as represented by copper phthalocyanine; accepting heterocyclic compounds such as hexacyano azatriphenylene; and coating-type polymer materials, in addition to the arylamine compounds of the general formula (1). These materials may be formed into a thin film by a vapor deposition method or other known methods such as a spin coating method and an inkjet method.

The arylamine compounds of the general formula (1) are used as the hole transport layer of the organic EL device of the present invention. These may be individually deposited for film forming, may be used as a single layer deposited mixed with other hole transporting materials, or may be formed as a laminate of individually deposited layers, a laminate of mixedly deposited layers, or a laminate of the individually deposited layer and the mixedly deposited layer. These materials may be formed into a thin-film by a vapor deposition method or other known methods such as a spin coating method and an inkjet method.

Examples of a hole transporting material that can be mixed or can be used at the same time with the arylamine compounds of the general formula (1) can be benzidine derivatives such as N,N′-diphenyl-N,N′-di(m-tolyl)benzidine (TPD), N,N′-diphenyl-N,N′-di(α-naphthyl)benzidine (NPD), and N,N,N′,N′-tetrabiphenylylbenzidine; 1,1-bis[4-(di-4-tolylamino)phenyl]cyclohexane (TAPC); arylamine compounds having a structure in which two triphenylamine structures are joined within a molecule via a single bond or a divalent group that does not contain a heteroatom such as the arylamine compounds of the general formula (4); arylamine compounds having a structure in which four triphenylamine structures are joined within a molecule via a single bond or a divalent group that does not contain a heteroatom such as the arylamine compounds of the general formula (5); and various triphenylamine trimers.

The material used for the hole injection layer or the hole transport layer may be obtained by p-doping materials such as trisbromophenylamine hexachloroantimony, and radialene derivatives (refer to WO2014/009310, for example) into a material commonly used for these layers, or may be, for example, polymer compounds each having, as a part of the compound structure, a structure of a benzidine derivative such as TPD.

In the case where the hole transport layer of the organic EL device of the present invention has a two-layer structure, the above hole transporting materials are used as the first hole transport layer, in addition to the arylamine compounds of the general formula (4) having two triphenylamine structures within a molecule, and the arylamine compounds of the general formula (5) having four triphenylamine structures within a molecule.

The above hole transporting materials are used as the second hole transport layer in addition to the arylamine compounds of the general formula (1).

Examples of material used for the electron blocking layer of the organic EL device of the present invention can be compounds having an electron blocking effect, including, for example, carbazole derivatives such as 4,4′,4″-tri(N-carbazolyl)triphenylamine (TCTA), 9,9-bis[4-(carbazol-9-yl)phenyl]fluorene, 1,3-bis(carbazol-9-yl)benzene (mCP), and 2,2-bis(4-carbazol-9-ylphenyl)adamantane (Ad-Cz); and compounds having a triphenylsilyl group and a triarylamine structure, as represented by 9-[4-(carbazol-9-yl)phenyl]-9-[4-(triphenylsilyl)phenyl]-9H-fluorene, in addition to the arylamine compounds of the general formula (1). These may be individually deposited for film forming, may be used as a single layer deposited mixed with other materials, or may be formed as a laminate of individually deposited layers, a laminate of mixedly deposited layers, or a laminate of the individually deposited layer and the mixedly deposited layer. These materials may be formed into a thin-film by using a vapor deposition method or other known methods such as a spin coating method and an inkjet method.

Examples of material used for the light emitting layer of the organic EL device of the present invention can be various metal complexes including, for example, quinolinol derivative metal complexes such as Alq₃; anthracene derivatives; bis(styryl)benzene derivatives; pyrene derivatives; oxazole derivatives; and polyparaphenylene vinylene derivatives; in addition to the amine derivatives of the general formula (2) having a condensed ring structure. Further, the light emitting layer may be made of a host material and a dopant material. Examples of the host material can be thiazole derivatives, benzimidazole derivatives, and polydialkyl fluorene derivatives, in addition to the above light-emitting materials. Examples of the dopant material can be quinacridone, coumarin, rubrene, perylene, pyrene, derivatives thereof, benzopyran derivatives, indenophenanthrene derivatives, rhodamine derivatives, and aminostyryl derivatives in addition to the amine derivatives of the general formula (2) having a condensed ring structure. These may be individually deposited for film forming, may be used as a single layer deposited mixed with other materials, or may be formed as a laminate of individually deposited layers, a laminate of mixedly deposited layers, or a laminate of the individually deposited layer and the mixedly deposited layer.

The dopant material in the light emitting layer of the organic EL device of the present invention is preferably the amine derivatives of the general formula (2) having a condensed ring structure.

Further, the light-emitting material may be a phosphorescent material. Phosphorescent materials as metal complexes of metals such as iridium and platinum may be used. Examples of the phosphorescent materials include green phosphorescent materials such as Ir(ppy)₃, blue phosphorescent materials such as FIrpic and FIr6, and red phosphorescent materials such as Btp₂Ir(acac). Here, carbazole derivatives such as 4,4′-di(N-carbazolyl)biphenyl (CBP), TCTA, and mCP may be used as the hole injecting and transporting host material. Compounds such as p-bis(triphenylsilyl)benzene (UGH2), and 2,2′,2″-(1,3,5-phenylene)-tris(1-phenyl-1H-benzimidazole) (TPBI) may be used as the electron transporting host material. In this way, a high-performance organic EL device can be produced.

In order to avoid concentration quenching, the doping of the host material with the phosphorescent light-emitting material should preferably be made by co-evaporation in a range of 1 to 30 weight percent with respect to the whole light emitting layer.

Further, Examples of the light-emitting material may be delayed fluorescent-emitting material such as a CDCB derivative of PIC-TRZ, CC2TA, PXZ-TRZ, 4CzIPN or the like (refer to Non-Patent Document 3, for example).

These materials may be formed into a thin-film by using a vapor deposition method or other known methods such as a spin coating method and an inkjet method.

The hole blocking layer of the organic EL device of the present invention may be formed by using hole blocking compounds such as various rare earth complexes, triazole derivatives, triazine derivatives, and oxadiazole derivatives, in addition to the metal complexes of phenanthroline derivatives such as bathocuproin (BCP), and the metal complexes of quinolinol derivatives such as aluminum(III) bis(2-methyl-8-quinolinate)-4-phenylphenolate (BAlq). These materials may also serve as the material of the electron transport layer. These may be individually deposited for film forming, may be used as a single layer deposited mixed with other materials, or may be formed as a laminate of individually deposited layers, a laminate of mixedly deposited layers, or a laminate of the individually deposited layer and the mixedly deposited layer. These materials may be formed into a thin-film by using a vapor deposition method or other known methods such as a spin coating method and an inkjet method.

Material used for the electron transport layer of the organic EL device of the present invention can be the compounds of the general formula (3) having an anthracene ring structure, far preferably, the compounds of the general formulas (3a), (3b), or (3c) having an anthracene ring structure. These may be individually deposited for film forming, may be used as a single layer deposited mixed with other electron transporting materials, or may be formed as a laminate of individually deposited layers, a laminate of mixedly deposited layers, or a laminate of the individually deposited layer and the mixedly deposited layer. These materials may be formed into a thin film by a vapor deposition method or other known methods such as a spin coating method and an inkjet method.

Examples of the electron transporting material that can be mixed or can be used at the same time with the compounds of the general formula (3) having an anthracene ring structure can be various metal complexes, including, for example, metal complexes of quinolinol derivatives such as Alq₃ and BAlq, triazole derivatives, triazine derivatives, oxadiazole derivatives, pyridine derivatives, pyrimidine derivatives, benzimidazole derivatives, thiadiazole derivatives, anthracene derivatives, carbodiimide derivatives, quinoxaline derivatives, pyridoindole derivatives, phenanthroline derivatives, and silole derivatives.

Examples of material used for the electron injection layer of the organic EL device of the present invention can be alkali metal salts such as lithium fluoride and cesium fluoride; alkaline earth metal salts such as magnesium fluoride; and metal oxides such as aluminum oxide. However, the electron injection layer may be omitted in the preferred selection of the electron transport layer and the cathode.

The cathode of the organic EL device of the present invention may be made of an electrode material with a low work function such as aluminum, or an alloy of an electrode material with an even lower work function such as a magnesium-silver alloy, a magnesium-indium alloy, or an aluminum-magnesium alloy.

The following describes an embodiment of the present invention in more detail based on Examples. The present invention, however, is not restricted to the following Examples.

Example 1 Synthesis of 4-{(biphenyl-4-yl)-phenylamino}-4″-{(9,9-dimethyl-9H-fluoren-2-yl)-phenylamino}-1,1′:3′,1″-terphenyl (Compound 1-5)

N-(biphenyl-4-yl)-N-(4-bromophenyl)aniline (8.0 g), N-(9,9-dimethyl-9H-fluoren-2-yl)-N-{3′-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)biphenyl-4-yl}aniline (11.4 g), potassium carbonate (7.5 g), water (64 ml), toluene (64 ml), ethanol (16 ml), and tetrakis(triphenylphosphine)palladium (0.8 g) were added into a nitrogen-substituted reaction vessel, and the mixture was heated and stirred at 70° C. for 16 hours. The mixture was cooled to a room temperature, and an organic layer was collected by liquid separation after adding ethyl acetate and water. After the organic layer was concentrated, recrystallization with a THF/acetone mixed solvent was carried out to obtain a white powder of 4-{(biphenyl-4-yl)-phenylamino}-4″-{(9,9-dimethyl-9H-fluoren-2-yl)-phenylamino}-1,1′:3′,1″-terphenyl (Compound 1-5; 9.54 g; yield 69%).

The structure of the obtained white powder was identified by NMR.

¹H-NMR (THF-d₈) detected 44 hydrogen signals, as follows.

δ (ppm)=7.86 (1H), 7.68-6.97 (37H), 1.41 (6H).

Example 2 Synthesis of 4-{(biphenyl-4-yl)-phenylamino}-4″-{(naphthalene-1-yl)-phenylamino}-1,1′:3′,1″-terphenyl (Compound 1-6)

The reaction was carried out under the same conditions as those of Example 1, except that N-(biphenyl-4-yl)-N-(4-bromophenyl)aniline was replaced with N-(3′-bromobiphenyl-4-yl)-N-(naphthalene-1-yl)aniline, and N-(9,9-dimethyl-9H-fluoren-2-yl)-N-{3′-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)biphenyl-4-yl}aniline was replaced with 4-{N-(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-phenylboronic acid. As a result, a pale yellowish white powder of 4-{(biphenyl-4-yl)-phenylamino}-4″-{(naphthalene-1-yl)-phenylamino}-1,1′:3′,1″-terphenyl (Compound 1-6; 7.88 g; yield 62%) was obtained.

The structure of the obtained pale yellowish white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 42 hydrogen signals, as follows.

δ (ppm)=7.98 (1H), 7.92 (1H), 7.84-7.75 (2H), 7.70-6.94 (32H), 1.49 (6H).

Example 3 Synthesis of 3,3″-bis{(biphenyl-4-yl)-phenylamino}-1,1′:4′,1″-terphenyl (Compound 1-21)

1,4-dibromobenzene (6.20 g), (biphenyl-4-yl)-{3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)phenyl}-phenylamine (25.1 g), potassium carbonate (10.8 g), water (39 ml), toluene (380 ml), and ethanol (95 ml) were added into a nitrogen-substituted reaction vessel and aerated with nitrogen gas under ultrasonic irradiation for 30 minutes. The mixture was heated after adding tetrakis(triphenylphosphine)palladium (0.95 g), and stirred for 18 hours under reflux. The mixture was cooled to a room temperature, and water (200 ml), and heptane (190 ml) was added. A precipitate was collected by filtration. The precipitate was dissolved under heat in 1,2-dichlorobenzene (1200 ml) and purified by adsorption with a silica gel (39 g) and further purified by adsorption with an activated clay (19 g). A crude product precipitated by adding methanol (725 ml) was collected by filtration. After the crude product was repeatedly crystallized with 1,2-dichloromethane/methanol mixed solvent, the product was washed under reflux with methanol (300 ml) to obtain a white powder of 3,3″-bis{(biphenyl-4-yl)-phenylamino}-1,1′:4′,1″-terphenyl (Compound 1-21; 15.22 g; yield 81%).

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 40 hydrogen signals, as follows.

δ (ppm)=7.61 (2H), 7.56-6.83 (38H).

Example 4 Synthesis of 2,2″-bis{(biphenyl-4-yl)-phenylamino}-1,1′:4′,1″-terphenyl (Compound 1-22)

The reaction was carried out under the same conditions as those of Example 3, except that (biphenyl-4-yl)-{3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)phenyl}-phenylamine was replaced with N-(biphenyl-4-yl)-N-{2-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)phenyl}-phenylamine. As a result, a white powder of 2,2″-bis{(biphenyl-4-yl)-phenylamino}-1,1′:4′,1″-terphenyl (Compound 1-22; 11.11 g; yield 58%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (THF-d₈) detected 40 hydrogen signals, as follows.

δ (ppm)=7.52 (4H), 7.40-7.20 (18H), 7.03 (8H), 6.90-6.75 (10H).

Example 5 Synthesis of 4-{bis(biphenyl-4-yl)amino}-2″-{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′:4′,1″-terphenyl (Compound 1-32)

N-(biphenyl-4-yl)-N-(2″-bromo-1,1′:4′,1″-terphenyl-4-yl)aniline (10.0 g), 2-(phenylamino)-9,9-dimethyl-9H-fluoren (6.2 g), palladium acetate (0.081 g), tert-butoxy sodium (3.5 g), a toluene solution (0.146 g) containing 50% (w/v) tri-tert-butylphosphine, toluene (100 ml) were added into a nitrogen-substituted reaction vessel, and the mixture was heated and stirred at 100° C. overnight. After the insoluble matter was removed by filtration and the filtrate was concentrated, purification by column chromatography

(support: silica gel, eluent: heptane/dichloromethane) was performed to obtain a white powder of 4-{bis(biphenyl-4-yl)amino}-2″-{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′:4′,1″-terphenyl (Compound 1-32; 4.77 g; yield 35%).

The structure of the obtained white powder was identified by NMR.

¹H-NMR (THF-d₈) detected 44 hydrogen signals, as follows.

δ (ppm)=7.61-7.48 (4H), 7.42-6.92 (32H), 6.81 (1H), 6.76 (1H), 1.28 (6H).

Example 6 Synthesis of 4,4″-bis{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′:3′,1″-terphenyl (Compound 1-34)

4,4″-dibromo-1,1′:3′,1″-terphenyl (8.81 g), 2-(phenylamino)-9,9-dimethyl-9H-fluoren (13.6 g), tert-butoxy sodium (5.12 g), tris(dibenzylideneacetone)dipalladium (0.33 g), a toluene solution (0.63 ml) containing 50% (w/v) tri-tert-butylphosphine were added into a nitrogen-substituted reaction vessel, and the mixture was heated and stirred for 2 hours under reflux.

After allowing the mixture to cool, methanol was added, and a precipitate was collected by filtration. The precipitate was dissolved under heat in chlorobenzene, and purified by adsorption with a silica gel and further purified by adsorption with an activated clay. After the purified product was crystallized with chlorobenzene/methanol mixed solvent, the product was washed under reflux with methanol to obtain a white powder of 4,4″-bis{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′:3′,1″-terphenyl Compound 1-34; 16.25 g; yield 90%).

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 48 hydrogen signals, as follows.

δ (ppm)=7.84 (1H), 7.70-7.03 (35H), 1.48 (12H).

Example 7 Synthesis of 2-{(biphenyl-4-yl)-phenylamino}-4″-{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′:4′,1″-terphenyl (Compound 1-37)

The reaction was carried out under the same conditions as those of Example 5, except that N-(biphenyl-4-yl)-N-(2″-bromo-1,1′:4′,1″-terphenyl-4-yl)aniline was replaced with N-(9,9-dimethyl-9H-fluorene-2-yl)-N-(2″-bromo-1,1′:4′,1″-terphenyl-4-yl)aniline, and 2-(phenylamino)-9,9-dimethyl-9H-fluoren was replaced with N-(biphenyl-4-yl)-N-phenylaniline. As a result, a white powder of 2-{(biphenyl-4-yl)-phenylamino}-4″-{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′:4′,1″-terphenyl (Compound 1-37; 11.7 g; yield 73%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 44 hydrogen signals, as follows.

δ (ppm)=7.68 (1H), 7.64-6.84 (37H), 1.48 (6H).

Example 8 Synthesis of 4,4″-bis{N-(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′: 2′,1″-terphenyl (Compound 1-38)

The reaction was carried out under the same conditions as those of Example 3, except that 1,4-dibromobenzene was replaced with 1,2-diiodobenzene, and (biphenyl-4-yl)-{3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)phenyl}-phenylamine was replaced with 4-{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-phenylboronic acid. As a result, a white powder of 4,4″-bis{N-(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′:2′,1″-terphenyl (Compound 1-38; 6.6 g; yield 39%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 48 hydrogen signals, as follows.

δ (ppm)=7.64 (2H), 7.58 (2H), 7.45-6.99 (32H), 1.38 (12H).

Example 9 Synthesis of 4,4″-bis{N-bis(biphenyl-4-yl)amino}-1,1′:2′,1″-terphenyl (Compound 1-39)

The reaction was carried out under the same conditions as those of Example 3, except that 1,4-dibromobenzene was replaced with 1,2-diiodobenzene, and (biphenyl-4-yl)-{3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)phenyl}-phenylamine was replaced with 4-{bis(biphenyl-4-yl)amino}-phenylboronic acid. As a result, a white powder of 4,4″-bis{N-bis(biphenyl-4-yl)amino}-1,1′:2′,1″-terphenyl (Compound 1-39; 4.6 g; yield 24%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 48 hydrogen signals, as follows.

δ (ppm)=7.57-7.28 (32H), 7.21 (8H), 7.11 (8H).

Example 10 Synthesis of 4,4″-bis{(biphenyl-4-yl)-(naphthalene-1-yl)amino}-1,1′: 2′,1″-terphenyl (Compound 1-41)

The reaction was carried out under the same conditions as those of Example 6, except that 4,4″-dibromo-1,1′: 3′,1″-terphenyl was replaced with 4,4″-dibromo-1,1′: 2′,1″-terphenyl, and 2-(phenylamino)-9,9-dimethyl-9H-fluoren was replaced with (biphenyl-4-yl)-(naphthalene-1-yl)amine. As a result, a white powder of 4,4″-bis{(biphenyl-4-yl)-(naphthalene-1-yl)amino}-1,1′: 2′,1″-terphenyl (Compound 1-41; 5.0 g; yield 30%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 44 hydrogen signals, as follows.

δ (ppm)=7.93-7.84 (4H), 7.79 (2H), 7.60-7.26 (24H), 7.25-6.92 (14H).

Example 11 Synthesis of 4,4″-bis[{4-(naphthalene-1-yl)phenyl}-phenylamino]-1,1′: 2′,1″-terphenyl (Compound 1-42)

The reaction was carried out under the same conditions as those of Example 6, except that 4,4″-dibromo-1,1′: 3′,1″-terphenyl was replaced with 4,4″-dibromo-1,1′: 2′,1″-terphenyl, and 2-(phenylamino)-9,9-dimethyl-9H-fluoren was replaced with {4-(naphthalene-1-yl)phenyl}-phenylamine. As a result, a white powder of 4,4″-bis[{4-(naphthalene-1-yl)phenyl}-phenylamino]-1,1′: 2′,1″-terphenyl (Compound 1-42; 7.3 g; yield 43%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 44 hydrogen signals, as follows.

δ (ppm)=8.01 (2H), 7.91 (2H), 7.84 (2H), 7.53-6.98 (38H).

Example 12 Synthesis of 4,4″-bis[{4-(naphthalene-1-yl)phenyl}-phenylamino]-1,1′: 3′,1″-terphenyl (Compound 1-45)

The reaction was carried out under the same conditions as those of Example 6, except that 2-(phenylamino)-9,9-dimethyl-9H-fluoren was replaced with {4-(naphthalene-1-yl)phenyl}-phenylamine. As a result, a white powder of 4,4″-bis[{4-(naphthalene-1-yl)phenyl}-phenylamino]-1,1′: 3′,1″-terphenyl (Compound 1-45; 16.7 g; yield 79%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 44 hydrogen signals, as follows.

δ (ppm)=8.08 (2H), 7.94 (2H), 7.90-7.80 (3H), 7.65-7.00 (37H).

Example 13 Synthesis of 2,2″-bis{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′: 3′,1″-terphenyl (Compound 1-47)

The reaction was carried out under the same conditions as those of Example 3, except that 1,4-dibromobenzene was replaced with 1,3-diiodobenzene, and (biphenyl-4-yl)-{3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)phenyl}-phenylamine was replaced with 2-{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-phenylboronic acid. As a result, a white powder of 2,2″-bis{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′: 3′,1″-terphenyl (Compound 1-47; 4.2 g; yield 25%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 48 hydrogen signals, as follows.

δ (ppm)=7.60 (2H), 7.38-7.09 (14H), 6.95-6.71 (14H), 6.66-6.56 (4H), 6.35 (2H), 6.26 (12H).

Example 14 Synthesis of 2,2″-bis{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′: 4′,1″-terphenyl (Compound 1-49)

The reaction was carried out under the same conditions as those of Example 3, except that (biphenyl-4-yl)-{3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)phenyl}-phenylamine was replaced with 2-{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-phenylboronic acid. As a result, a white powder of 2,2″-bis{(9,9-dimethyl-9H-fluorene-2-yl)-phenylamino}-1,1′: 4′,1″-terphenyl (Compound 1-49; 13.7 g; yield 76%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (THF-d₈) detected 48 hydrogen signals, as follows.

δ (ppm)=7.53 (2H), 7.35-6.81 (30H), 6.76 (2H), 6.67 (2H), 1.29 (12H).

Example 15 Synthesis of 4,4″-bis{(triphenylen-2-yl)-phenylamino}-1,1′: 4′,1″-terphenyl (Compound 1-88)

The reaction was carried out under the same conditions as those of Example 6, except that 4,4″-dibromo-1,1′: 3′,1″-terphenyl was replaced with 4,4″-diiodo-1,1′: 4′,1″-terphenyl, and 2-(phenylamino)-9,9-dimethyl-9H-fluoren was replaced with (triphenylen-2-yl)-phenylamine. As a result, a white powder of 4,4″-bis{(triphenylen-2-yl)-phenylamino}-1,1′: 4′,1″-terphenyl (Compound 1-88; 11.4 g; yield 74%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (THF-d₈) detected 44 hydrogen signals, as follows.

δ (ppm)=8.72-8.62 (8H), 8.45 (2H), 8.36 (2H), 7.75 (4H), 7.70-7.21 (26H), 7.09 (2H).

Example 16 Synthesis of 4-{(biphenyl-4-yl)-phenylamino}-4″-[{4-(1-phenyl-indol-4-yl)phenyl}-phenylamino]-1,1′: 4′,1″-terphenyl (Compound 1-91)

The reaction was carried out under the same conditions as those of Example 1, except that N-(biphenyl-4-yl)-N-(4-bromophenyl)aniline was replaced with (4′-bromo-1,1′-biphenyl-4-yl)-{4-(1-phenyl-indol-4-yl)phenyl}-phenylamine, and N-(9,9-dimethyl-9H-fluoren-2-yl)-N-{3′-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)biphenyl-4-yl}aniline was replaced with {4-(4,4,5,5-tetramethyl-1,3,2-dioxabororan-2-yl)phenyl}-(1,1′-biphenyl-4-yl)-phenylamine. As a result, a pale yellowish white powder of 4-{(biphenyl-4-yl)-phenylamino}-4″-[{4-(1-phenyl-indol-4-yl)phenyl}-phenylamino]-1,1′: 4′,1″-terphenyl (Compound 1-91; 6.80 g; yield 67%) was obtained.

The structure of the obtained pale yellowish white powder was identified by NMR.

¹H-NMR (THF-d₈) detected 45 hydrogen signals, as follows.

δ (ppm)=7.70 (4H), 7.68-7.50 (16H), 7.42-7.11 (23H), 7.05 (1H), 6.88 (1H).

Example 17 Synthesis of 4,4″-bis{N-phenyl-N-(2-phenyl-biphenyl-4-yl)amino}-1,1′: 4′,1″-terphenyl (Compound 1-101)

4,4″-diiodo-1,1′: 4′,1″-terphenyl (13.0 g), N-phenyl-N-(2-phenyl-biphenyl-4-yl)amine (20.0 g), a copper powder (0.18 g), potassium carbonate (11.3 g), 3,5-di-tert-butylsalicylic acid (0.7 g), sodium bisulfite (0.86 g), dodecylbenzene (30 ml) were added into a nitrogen-substituted reaction vessel, and the mixture was heated and stirred at 210° C. for 24 hours. The mixture was cooled, and a solid was collected by filtration after adding xylene (30 ml) and methanol (60 ml). Toluene (250 ml) and silica gel (20 g) were added to the obtained solid, and after heated up to 90° C., insoluble matter was removed by hot filtration. After adding ethyl acetate and methanol to the crude product obtained by concentration, a precipitated crystal was collected by filtration. Recrystallization with chlorobenzene and washing under reflux with methanol were carried out to obtain a white powder of 4,4″-bis-{N-phenyl-N-(2-phenyl-biphenyl-4-yl)amino}-1,1′: 4′,1″-terphenyl (Compound 1-101; 16.9 g; yield 72%).

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 48 hydrogen signals, as follows.

δ (ppm)=7.68 (4H), 7.62-7.55 (4H), 7.39-7.06 (40H).

Example 18 Synthesis of 4,4″-bis{N-phenyl-N-(2-phenyl-biphenyl-4-yl)amino}-1,1′: 2′,1″-terphenyl (Compound 1-103)

The reaction was carried out under the same conditions as those of Example 6, except that 4,4″-dibromo-1,1′: 3′,1″-terphenyl was replaced with 4,4″-dibromo-1,1′: 2′,1″-terphenyl, and 2-(phenylamino)-9,9-dimethyl-9H-fluoren was replaced with N-phenyl-N-(2-phenyl-biphenyl-4-yl)amine. As a result, a white powder of 4,4″-bis{N-phenyl-N-(2-phenyl-biphenyl-4-yl)amino}-1,1′: 2′,1″-terphenyl (Compound 1-103; 4.3 g; yield 42%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 48 hydrogen signals, as follows.

δ (ppm)=7.50-7.39 (4H), 7.31-6.97 (44H).

Example 19 Synthesis of 4,4″-bis{N-phenyl-N-(2-phenyl-biphenyl-4-yl)amino}-1,1′: 3′,1″-terphenyl (Compound 1-104)

The reaction was carried out under the same conditions as those of Example 6, except that 2-(phenylamino)-9,9-dimethyl-9H-fluoren was replaced with N-phenyl-N-(2-phenyl-biphenyl-4-yl)amine. As a result, a white powder of 4,4″-bis{N-phenyl-N-(2-phenyl-biphenyl-4-yl)amino}-1,1′: 3′,1″-terphenyl (Compound 1-104; 7.7 g; yield 53%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 48 hydrogen signals, as follows.

δ (ppm)=7.81 (2H), 7.61-7.48 (14H), 7.39-7.06 (32H).

Example 20

The glass transition points of the arylamine compounds of the general formula (1) were determined using a high-sensitive differential scanning calorimeter (DSC3100S produced by Bruker AXS).

Glass transition point Compound of Example 1 117° C. Compound of Example 2 117° C. Compound of Example 3 103° C. Compound of Example 5 115° C. Compound of Example 6 124° C. Compound of Example 7 114° C. Compound of Example 8 119° C. Compound of Example 9 106° C. Compound of Example 10 127° C. Compound of Example 11 111° C. Compound of Example 12 122° C. Compound of Example 13 116° C. Compound of Example 14 117° C. Compound of Example 15 163° C. Compound of Example 16 125° C. Compound of Example 17 124° C. Compound of Example 18 115° C. Compound of Example 19 122° C.

The arylamine compounds of the general formula (1) have glass transition points of 100° C. or higher, demonstrating that the compounds have a stable thin-film state.

Example 21

A 100 nm-thick vapor-deposited film was fabricated on an ITO substrate using the arylamine compounds of the general formula (1), and a work function was measured using an ionization potential measuring device (PYS-202 produced by Sumitomo Heavy Industries, Ltd.).

Work function Compound of Example 1 5.68 eV Compound of Example 2 5.65 eV Compound of Example 3 5.79 eV Compound of Example 4 5.83 eV Compound of Example 5 5.69 eV Compound of Example 6 5.65 eV Compound of Example 7 5.67 eV Compound of Example 8 5.64 eV Compound of Example 9 5.66 eV Compound of Example 10 5.69 eV Compound of Example 11 5.75 eV Compound of Example 12 5.76 eV Compound of Example 13 5.72 eV Compound of Example 14 5.72 eV Compound of Example 15 5.62 eV Compound of Example 16 5.67 eV Compound of Example 17 5.67 eV Compound of Example 18 5.75 eV Compound of Example 19 5.76 eV

As the results show, the arylamine compounds of the general formula (1) have desirable energy levels compared to the work function 5.4 eV of common hole transport materials such as NPD and TPD, and thus possess desirable hole transportability.

Example 22 Synthesis of N5′,N5′,N9′,N9′-tetrakis{4-(tert-butyl)phenyl}spiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran)-5′,9′-diamine (Compound 2-1)

5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) (5.0 g), bis{4-(tert-butyl)phenyl}amine (6.0 g), palladium acetate (0.08 g), sodium tert-butoxide (3.4 g), tri-tert-butylphosphine (0.07 g), and toluene (60 ml) were added into a nitrogen-substituted reaction vessel, and the mixture was heated and stirred for 2 hours under reflux. The mixture was cooled to a room temperature, dichloromethane and water were added, and an organic layer was collected by liquid separation. After the organic layer was concentrated, purification by column chromatography was performed to obtain a powder of N5′,N5′,N9′,N9′-tetrakis{4-(tert-butyl)phenyl}spiro (fluorene-9,7′-fluoreno[4,3-b]benzofuran)-5′,9′-diamine (Compound 2-1; 3.1 g; yield 36%).

Example 23 Synthesis of N2,N2,N7,N7-tetrakis{4-(tert-butyl)phenyl}spiro(dibenzo[5,6:7,8]fluoreno[4,3-b] benzofuran-5,9′-fluorene)-2,7-diamine (Compound 2-2)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 2,7-dibromospiro(dibenzo[5,6:7,8]fluoreno [4,3-b]benzofuran-5,9′-fluorene). As a result, a powder of N2,N2,N7,N7-tetrakis{4-(tert-butyl)phenyl}spiro(dibenzo [5,6:7,8]fluoreno[4,3-b]benzofuran-5,9′-fluorene)-2,7-diamine (Compound 2-2; 2.5 g; yield 31%) was obtained.

Example 24 Synthesis of N5,N5,N9,N9-tetrakis{4-(tert-butyl)phenyl}spiro(benzo[5,6]fluoreno[4,3-b]benzofuran-7,9′-fluorene)-5,9-diamine (Compound 2-3)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 5,9-dibromospiro(benzo[5,6]fluoreno[4,3-b]benzofuran-7,9′-fluorene). As a result, a powder of N5,N5,N9,N9-tetrakis{4-(tert-butyl)phenyl}spiro(benzo[5,6] fluoreno[4,3-b]benzofuran-7,9′-fluorene)-5,9-diamine (Compound 2-3; 3.0 g; yield 36%) was obtained.

Example 25 <Synthesis of N6′,N6′,N10′,N10′-tetrakis{4-(tert-butyl)phenyl}spiro(fluorene-9,8′-fluoreno[3,4-b]benzofuran)-6′,10′-diamine (Compound 2-4)>

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 6′,10′-dibromospiro(fluorene-9,8′-fluoreno[3,4-b]benzofuran). As a result, a powder of N6′,N6′,N10′,N10′-tetrakis{4-(tert-butyl)phenyl}spiro (fluorene-9,8′-fluoreno[3,4-b]benzofuran)-6′,10′-diamine (Compound 2-4; 2.5 g; yield 34%) was obtained.

Example 26 Synthesis of N5,N5,N9,N9-tetrakis{4-(tert-butyl)phenyl}spiro(fluoreno[4,3-b]benzofuran-7,9′-xanthene)-5,9-diamine (Compound 2-5)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 5,9-dibromospiro(fluoreno[4,3-b]benzofuran-7,9′-xanthene). As a result, a powder of N5,N5,N9,N9-tetrakis{4-(tert-butyl)phenyl}spiro(fluoreno[4,3-b] benzofuran-7,9′-xanthene)-5,9-diamine (Compound 2-5; 2.4 g; yield 28%) was obtained.

Example 27 Synthesis of N5′,N9′-bis(biphenyl-4-yl)-N5′,N9′-bis{4-(tert-butyl)phenyl}-2-fluorospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran)-5′,9′-diamine (Compound 2-6)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 5′,9′-dibromo-2-fluorospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran), and bis{4-(tert-butyl)phenyl}amine was replaced with (biphenyl-4-yl)-{4-(tert-butyl)phenyl}amine. As a result, a powder of N5′,N9′-bis(biphenyl-4-yl)-N5′,N9′-bis{4-(tert-butyl) phenyl}-2-fluorospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran)-5′,9′-diamine (Compound 2-6; 2.4 g; yield 28%) was obtained.

Example 28 Synthesis of N5,N9-bis{4-(tert-butyl)phenyl}-N5,N9-bis{4-(trimethylsilyl)phenyl}spiro(benzo[5,6]fluoreno[4,3-b]benzofuran-7,9′-fluorene)-5,9-diamine (Compound 2-7)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 5,9-dibromospiro(benzo[5,6]fluoreno[4,3-b]benzofuran-7,9′-fluorene), and bis{4-(tert-butyl)phenyl}amine was replaced with {4-(tert-butyl)phenyl}-{4-(trimethylsilyl)phenyl}amine. As a result, a powder of N5,N9-bis{4-(tert-butyl)phenyl}-N5,N9-bis{4-(trimethylsilyl)phenyl}spiro(benzo[5,6]fluoreno[4,3-b]benzofuran-7,9′-fluorene)-5,9-diamine (Compound 2-7; 3.0 g; yield 35%) was obtained.

Example 29 <Synthesis of N5′,N9′-bis{4-(tert-butyl)phenyl}-N5′,N9′-bis{4-(trimethylsilyl)phenyl}spiro(fluorene-9,7′-fluoreno[4,3-b]benzothiophene)-5′,9′-diamine (Compound 2-8)>

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzothiophene), and bis{4-(tert-butyl)phenyl}amine was replaced with {4-(tert-butyl)phenyl}-{4-(trimethylsilyl)phenyl}amine. As a result, a powder of N5′,N9′-bis{4-(tert-butyl)phenyl}-N5′,N9′-bis{4-(trimethylsilyl)phenyl}spiro(fluorene-9,7′-fluoreno[4,3-b]benzothiophene)-5′,9′-diamine (Compound 2-8; 3.2 g; yield 37%) was obtained.

Example 30 Synthesis of N5,N9-bis(biphenyl-4-yl)-N5,N9-bis{4-(tert-butyl)phenyl}spiro(benzo[4′,5′]thieno[2′,3′: 5,6] fluoreno[4,3-b]benzofuran-7,9′-fluorene)-5,9-diamine (Compound 2-9)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 5,9-dibromospiro(benzo[4′,5′]thieno [2′,3′: 5,6]fluoreno[4,3-b]benzofuran-7,9′-fluorene), and bis{4-(tert-butyl)phenyl}amine was replaced with {4-(tert-butyl)phenyl}-(biphenyl-4-yl)amine. As a result, a powder of N5,N9-bis(biphenyl-4-yl)-N5,N9-bis{4-(tert-butyl)phenyl}spiro(benzo[4′,5′]thieno[2′,3′: 5,6]fluoreno[4,3-b]benzofuran-7,9′-fluorene)-5,9-diamine (Compound 2-9; 2.8 g; yield 34%) was obtained.

Example 31 Synthesis of N5′,N5′,N9′,N9′-tetrakis{4-(tert-butyl)phenyl}-12′,12′-dimethyl-12′H-spiro(fluorene-9,7′-indeno[1,2-a]fluorene)-5′,9′-diamine (Compound 2-10)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 5′,9′-dibromo-12′,12′-dimethyl-12′H-spiro(fluorene-9,7′-indeno[1,2-a]fluorene). As a result, a powder of N5′,N5′,N9′,N9′-tetrakis{4-(tert-butyl)phenyl}-12′,12′-dimethyl-12′H-spiro(fluorene-9,7′-indeno[1,2-a]fluorene)-5′,9′-diamine (Compound 2-10; 1.8 g; yield 49%) was obtained.

Example 32 <Synthesis of N6′,N10′-bis(biphenyl-4-yl)-N6′,N10′-bis{4-(tert-butyl)phenyl}-5′-methyl-5′H-spiro(fluorene-9,8′-indeno[2,1-c]carbazole)-6′,10′-diamine (Compound 2-11)>

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 6′,10′-dibromo-5′-methyl-5′H-spiro(fluorene-9,8′-indeno[2,1-c]carbazole), and bis{4-(tert-butyl)phenyl}amine was replaced with {4-(tert-butyl)phenyl}-(biphenyl-4-yl)amine. As a result, a powder of N6′,N10′-bis(biphenyl-4-yl)-N6′,N10′-bis{4-(tert-butyl)phenyl}-5′-methyl-5′H-spiro(fluorene-9,8′-indeno [2,1-c]carbazole)-6′,10′-diamine (Compound 2-11; 2.3 g; yield 41%) was obtained.

Example 33 Synthesis of N6,N6,N10,N10-tetrakis{4-(tert-butyl)phenyl}spiro(benzo[4′,5′]furo[2′,3′: 5,6]fluoreno[3,4-b]benzofuran-8,9′-fluorene)-6,10-diamine (Compound 2-22)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 6,10-dibromospiro(benzo[4′,5′]furo [2′,3′: 5,6]fluoreno[3,4-b]benzofuran-8,9′-fluorene). As a result, a powder of N6,N6,N10,N10-tetrakis{4-(tert-butyl)phenyl}spiro(benzo[4′,5′]furo[2′,3′: 5,6]fluoreno[3,4-b]benzofuran-8,9′-fluorene)-6,10-diamine (Compound 2-22; 1.5 g; yield 41%) was obtained.

Example 34 <Synthesis of N6,N6,N10,N10-tetrakis{4-(tert-butyl)phenyl}-8,8-diphenyl-benzo[4′,5′]furo[2′,3′: 5,6]fluoreno[3,4-b]benzofuran-6,10-diamine (Compound 2-23)>

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 6,10-dibromo-8,8-diphenyl-benzo[4′,5′]furo[2′,3′: 5,6]fluoreno[3,4-b]benzofuran. As a result, a powder of N6,N6,N10,N10-tetrakis{4-(tert-butyl)phenyl}-8,8-diphenyl-benzo[4′,5′]furo[2′,3′: 5,6] fluoreno[3,4-b]benzofuran-6,10-diamine (Compound 2-23; 3.2 g; yield 49%) was obtained.

Example 35 Synthesis of N6,N10-bis{4-(tert-butyl)phenyl}-N6,N10-bis{4-(trimethylsilyl)phenyl}spiro(benzo[4′,5′] furo[2′,3′: 5,6]fluoreno[3,4-b]benzofuran-8,9′-fluorene)-6,10-diamine (Compound 2-24)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 6,10-dibromospiro(benzo[4′,5′]furo [2′,3′: 5,6]fluoreno[3,4-b]benzofuran-8,9′-fluorene), and bis{4-(tert-butyl)phenyl}amine was replaced with {4-(tert-butyl)phenyl}-{4-(trimethylsilyl)phenyl}amine. As a result, a powder of N6,N10-bis{4-(tert-butyl)phenyl}-N6,N10-bis{4-(trimethylsilyl)phenyl}spiro(benzo[4′,5′]furo [2′,3′: 5,6]fluoreno[3,4-b]benzofuran-8,9′-fluorene)-6,10-diamine (Compound 2-24; 2.3 g; yield 43%) was obtained.

Example 36 Synthesis of N6,N6,N10,N10-tetrakis{4-(tert-butyl)phenyl}-8,8-bis{4-(tert-butyl)phenyl}-benzo[4′,5′]furo[2′,3′: 5,6]fluoreno[3,4-b]benzofuran-6,10-diamine (Compound 2-25)

The reaction was carried out under the same conditions as those of Example 22, except that 5′,9′-dibromospiro(fluorene-9,7′-fluoreno[4,3-b]benzofuran) was replaced with 6,10-dibromo-8,8-bis{4-(tert-butyl)phenyl}-benzo[4′,5′]furo[2′,3′: 5,6]fluoreno[3,4-b]benzofuran. As a result, a powder of N6,N6,N10,N10-tetrakis{4-(tert-butyl)phenyl}-8,8-bis{4-(tert-butyl)phenyl}-benzo[4′,5′] furo[2′,3′: 5,6]fluoreno[3,4-b]benzofuran-6,10-diamine (Compound 2-25; 8.2 g; yield 54%) was obtained.

Example 37

The organic EL device, as shown in FIG. 1, was fabricated by vapor-depositing a hole injection layer 3, a first hole transport layer 4, a second hole transport layer 5, a light emitting layer 6, an electron transport layer 7, an electron injection layer 8, and a cathode (aluminum electrode) 9 in this order on a glass substrate 1 on which an ITO electrode was formed as a transparent anode 2 beforehand.

Specifically, the glass substrate 1 having ITO (film thickness of 150 nm) formed thereon was subjected to ultrasonic washing in isopropyl alcohol for 20 minutes and then dried for 10 minutes on a hot plate heated to 200° C. After UV ozone treatment for 15 minutes, the glass substrate with ITO was installed in a vacuum vapor deposition apparatus, and the pressure was reduced to 0.001 Pa or lower. Compound HIM-1 of the structural formula below was then formed in a film thickness of 5 nm as the hole injection layer 3 so as to cover the transparent anode 2. The first hole transport layer 4 was formed on the hole injection layer 3 by forming the arylamine compounds (4-1) of the structural formula below having two triphenylamine structures within a molecule in a film thickness of 45 nm. The second hole transport layer 5 was formed on the first hole transport layer 4 by forming the compound (1-21) of Example 3 in a film thickness of 5 nm. Then, the light emitting layer 6 was formed on the second hole transport layer 5 in a film thickness of 25 nm by dual vapor deposition of the compound (2-4) of Example 25 and Compound EMH-1 of the structural formula below at a vapor deposition rate ratio of the compound (2-4): EMH-1=5:95. The electron transport layer 7 was formed on the light emitting layer 6 in a film thickness of 30 nm by dual vapor deposition of the compound (3a-1) of the structural formula below having an anthracene ring structure and Compound ETM-1 of the structural formula below at a vapor deposition rate ratio of the compound (3a-1): ETM-1=50:50. The electron injection layer 8 was formed on the electron transport layer 7 by forming lithium fluoride in a film thickness of 1 nm. Finally, the cathode 9 was formed by vapor-depositing aluminum in a thickness of 100 nm. The characteristics of the thus fabricated organic EL device were measured in the atmosphere at an ordinary temperature. Table 1 summarizes the results of emission characteristics measurements performed by applying a DC voltage to the fabricated organic EL device.

Example 38

An organic EL device was fabricated under the same conditions used in Example 37, except that the second hole transport layer 5 was formed by forming the compound (1-37) of Example 7 in a film thickness of 5 nm, instead of using the compound (1-21) of Example 3. The characteristics of the organic EL device thus fabricated were measured in the atmosphere at an ordinary temperature. Table 1 summarizes the results of emission characteristics measurements performed by applying a DC voltage to the fabricated organic EL device.

Example 39

An organic EL device was fabricated under the same conditions used in Example 37, except that the second hole transport layer 5 was formed by forming the compound (1-45) of Example 12 in a film thickness of 5 nm, instead of using the compound (1-21) of Example 3. The characteristics of the organic EL device thus fabricated were measured in the atmosphere at an ordinary temperature. Table 1 summarizes the results of emission characteristics measurements performed by applying a DC voltage to the fabricated organic EL device.

Example 40

An organic EL device was fabricated under the same conditions used in Example 37, except that the light emitting layer 6 was formed by forming the compound (2-10) of Example 31 in a film thickness of 25 nm, instead of using the compound (2-4) of Example 25, by dual vapor deposition of the compound (2-10) and Compound EMH-1 of the structural formula above at a vapor deposition rate ratio of the compound (2-10): EMH-1=5:95. The characteristics of the organic EL device thus fabricated were measured in the atmosphere at an ordinary temperature. Table 1 summarizes the results of emission characteristics measurements performed by applying a DC voltage to the fabricated organic EL device.

Example 41

An organic EL device was fabricated under the same conditions used in Example 40, except that the second hole transport layer 5 was formed by forming the compound (1-37) of Example 7 in a film thickness of 5 nm, instead of using the compound (1-21) of Example 3. The characteristics of the organic EL device thus fabricated were measured in the atmosphere at an ordinary temperature. Table 1 summarizes the results of emission characteristics measurements performed by applying a DC voltage to the fabricated organic EL device.

Example 42

An organic EL device was fabricated under the same conditions used in Example 40, except that the second hole transport layer 5 was formed by forming the compound (1-45) of Example 12 in a film thickness of 5 nm, instead of using the compound (1-21) of Example 3. The characteristics of the organic EL device thus fabricated were measured in the atmosphere at an ordinary temperature. Table 1 summarizes the results of emission characteristics measurements performed by applying a DC voltage to the fabricated organic EL device.

Comparative Example 1

For comparison, an organic EL device was fabricated under the same conditions used in Example 37, except that the first hole transport layer 4 was formed by forming the arylamine compound (4′-2) of the structural formula below having two triphenylamine structures within a molecule in a film thickness of 45 nm, instead of using the compound (4-1) of the structural formula having two triphenylamine structures within a molecule, then the second hole transport layer 5 was formed by forming the arylamine compound (4′-2) of the structural formula below having two triphenylamine structures within a molecule in a film thickness of 5 nm, instead of using the compound (1-21) of Example 3. The characteristics of the organic EL device thus fabricated were measured in the atmosphere at an ordinary temperature. Table 1 summarizes the results of emission characteristics measurements performed by applying a DC voltage to the fabricated organic EL device.

Comparative Example 2

For comparison, an organic EL device was fabricated under the same conditions used in Example 40, except that the first hole transport layer 4 was formed by forming the arylamine compound (4′-2) of the structural formula having two triphenylamine structures within a molecule in a film thickness of 45 nm, instead of using the compound (4-1) of the structural formula having two triphenylamine structures within a molecule, then the second hole transport layer 5 was formed by forming the arylamine compound (4′-2) of the structural formula having two triphenylamine structures within a molecule in a film thickness of 5 nm, instead of using the compound (1-21) of Example 3. The characteristics of the organic EL device thus fabricated were measured in the atmosphere at an ordinary temperature. Table 1 summarizes the results of emission characteristics measurements performed by applying a DC voltage to the fabricated organic EL device.

Table 1 summarizes the results of the device lifetime measurements performed with the organic EL devices fabricated in Examples 37 to 42 and Comparative Examples 1 to 2. A device lifetime was measured as the time elapsed until the emission luminance of 2,000 cd/m² (initial luminance) at the start of emission was attenuated to 1,900 cd/m² (corresponding to attenuation to 95% when taking the initial luminance as 100%) when carrying out constant current driving.

TABLE 1 Current Power Device First hole Second hole Electron Luminance efficiency efficiency lifetime transport transport Light emitting Transport Voltage [V] [cd/m²] [cd/A] [lm/W] (Attenuation layer layer layer layer (@10 mA/cm²) (@10 mA/cm²) (@10 mA/cm²) (@10 mA/cm²) to 95%) Ex. 37 Compound Compound Compound Compound 4.11 746 7.45 5.70 105 h 4-1 1-21 2-4/ 3a-1/ EMH-1 ETM-1 Ex. 38 Compound Compound Compound Compound 4.14 764 7.64 5.80 132 h 4-1 1-37 2-4/ 3a-1/ EMH-1 ETM-1 Ex. 39 Compound Compound Compound Compound 4.25 788 7.88 5.83 123 h 4-1 1-45 2-4/ 3a-1/ EMH-1 ETM-1 Ex. 40 Compound Compound Compound Compound 4.14 741 7.41 5.63 134 h 4-1 1-21 2-10/ 3a-1/ EMH-1 ETM-1 Ex. 41 Compound Compound Compound Compound 4.13 775 7.74 5.89 135 h 4-1 1-37 2-10/ 3a-1/ EMH-1 ETM-1 Ex. 42 Compound Compound Compound Compound 4.26 752 7.52 5.55 127 h 4-1 1-45 2-10/ 3a-1/ EMH-1 ETM-1 Com. Compound Compound Compound Compound 4.07 585 5.86 4.52  47 h Ex. 1 4′-2 4′-2 2-4/ 3a-1/ EMH-1 ETM-1 Com. Compound Compound Compound Compound 4.07 585 5.86 4.53  54 h Ex. 2 4′-2 4′-2 2-10/ 3a-1/ EMH-1 ETM-1

As shown in Table 1, the current efficiency upon passing a current with a current density of 10 mA/cm² was 7.41 to 7.88 cd/A for the organic EL devices in Examples 37 to 42, which was higher than 5.86 cd/A for the organic EL devices in Comparative Examples 1 to 2. Further, the power efficiency was 5.55 to 5.89 lm/W for the organic EL devices in Examples 37 to 42, which was higher than 4.52 to 4.53 lm/W for the organic EL devices in Comparative Examples 1 to 2. Table 1 also shows that the device lifetime (attenuation to 95%) was 105 to 135 hours for the organic EL devices in Examples 37 to 42, showing achievement of a far longer lifetime than 47 to 54 hours for the organic EL devices in Comparative Examples 1 to 2.

In the organic EL devices of the present invention, the combination of specific arylamine compounds and specific amine derivatives having a condensed ring structure (and specific compounds having an anthracene ring structure) can improve carrier balance inside the organic EL devices. Further, the organic EL devices of the present invention can achieve high luminous efficiency and a long lifetime, compared to the conventional organic EL devices by combining those compounds in carrier balance matching characteristics of the light-emitting material.

INDUSTRIAL APPLICABILITY

In the organic EL devices of the present invention with the combination of specific arylamine compounds and specific amine derivatives having a condensed ring structure (and specific compounds having an anthracene ring structure), luminous efficiency and durability of an organic EL device can be improved to attain potential applications for, for example, home electric appliances and illuminations.

DESCRIPTION OF REFERENCE NUMERAL

-   1 Glass substrate -   2 Transparent anode -   3 Hole injection layer -   4 First hole transport layer -   5 Second hole transport layer -   6 Light emitting layer -   7 Electron transport layer -   8 Electron injection layer -   9 Cathode 

1. An organic electroluminescent device comprising at least an anode, a hole transport layer, a light emitting layer, an electron transport layer and a cathode in this order, wherein the hole transport layer comprises an arylamine compound of the following general formula (1), and the light emitting layer comprises an amine derivative of the following general formula (2) having a condensed ring structure:

wherein Ar₁ to Ar₄ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group,

wherein A₁ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond; Ar₅ and Ar₆ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group, where Ar₅ and Ar₆ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring; R₁ to R₄ may be the same or different, and represent a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, substituted or unsubstituted aryloxy, or a disubstituted amino group substituted with a group selected from an aromatic hydrocarbon group, an aromatic heterocyclic group, and a condensed polycyclic aromatic group, where R₁ to R₄ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring, and R₁ to R₄ and the benzene ring binding with R₁ to R₄ may bind to each other via substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group; R₅ to R₇ may be the same or different, represent a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy, where R₅ to R₇ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring, and R₅ to R₇ and the benzene ring binding with R₅ to R₇ may bind to each other via substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group; and R₈ and R₉ may be the same or different, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy, where R₈ and R₉ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, a sulfur atom, or a mono-substituted amino group to form a ring.
 2. The organic electroluminescent device according to claim 1, wherein the electron transport layer comprises a compound of the following general formula (3) having an anthracene ring structure,

wherein A₂ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond; B represents a substituted or unsubstituted aromatic heterocyclic group; C represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group; D may be the same or different, and represents a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, trifluoromethyl, linear or branched alkyl of 1 to 6 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group; and p represents 7 or 8, and q represents 1 or 2 while maintaining a relationship that a sum of p and q is
 9. 3. The organic electroluminescent device according to claim 2, wherein the compound having an anthracene ring structure is a compound of the following general formula (3a) having an anthracene ring structure,

wherein A₂ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond; Ar₇, Ar₈, and Ar₉ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group; R₁₀ to R₁₆ may be the same or different, and represent a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy, where R₁₀ to R₁₆ may bind to each other via a single bond, substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom to form a ring; and X₁, X₂, X₃, and X₄ represent a carbon atom or a nitrogen atom, where only one of X₁, X₂, X₃, and X₄ is a nitrogen atom, and the nitrogen atom in this case does not have the hydrogen atom or the substituent for R₁₀ to R₁₃.
 4. The organic electroluminescent device according to claim 2, wherein the compound having an anthracene ring structure is a compound of the following general formula (3b) having an anthracene ring structure,

wherein A₂ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond; Ar₁₀, Ar₁₁, and Ar₁₂ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
 5. The organic electroluminescent device according to claim 2, wherein the compound having an anthracene ring structure is a compound of the following general formula (3c) having an anthracene ring structure,

wherein A₂ represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent group of substituted or unsubstituted condensed polycyclic aromatics, or a single bond; Ar₁₃, Ar₁₄, and Ar₁₅ may be the same or different, and represent a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group; and R₁₇ represents a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 6 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 6 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 6 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, or substituted or unsubstituted aryloxy.
 6. The organic electroluminescent device according to claim 1, wherein the hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, and the second hole transport layer comprises the arylamine compound of the general formula (1).
 7. The organic electroluminescent device according to claim 1, wherein the light emitting layer comprises an anthracene derivative.
 8. The organic electroluminescent device according to claim 7, wherein the light emitting layer comprises a host material that is an anthracene derivative.
 9. The organic electroluminescent device according to claim 2, wherein the hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, and the second hole transport layer comprises the arylamine compound of the general formula (1).
 10. The organic electroluminescent device according to claim 3, wherein the hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, and the second hole transport layer comprises the arylamine compound of the general formula (1).
 11. The organic electroluminescent device according to claim 4, wherein the hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, and the second hole transport layer comprises the arylamine compound of the general formula (1).
 12. The organic electroluminescent device according to claim 5, wherein the hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, and the second hole transport layer comprises the arylamine compound of the general formula (1).
 13. The organic electroluminescent device according to claim 2, wherein the light emitting layer comprises an anthracene derivative.
 14. The organic electroluminescent device according to claim 3, wherein the light emitting layer comprises an anthracene derivative.
 15. The organic electroluminescent device according to claim 4, wherein the light emitting layer comprises an anthracene derivative.
 16. The organic electroluminescent device according to claim 5, wherein the light emitting layer comprises an anthracene derivative.
 17. The organic electroluminescent device according to claim 6, wherein the light emitting layer comprises an anthracene derivative.
 18. The organic electroluminescent device according to claim 13, wherein the light emitting layer comprises a host material that is an anthracene derivative.
 19. The organic electroluminescent device according to claim 14, wherein the light emitting layer comprises a host material that is an anthracene derivative.
 20. The organic electroluminescent device according to claim 15, wherein the light emitting layer comprises a host material that is an anthracene derivative. 